Namur valves for 2-, 3-, and 4-way systems. Electrically or pneumatically operated for precise flow control in hydraulic and pneumatic applications.
IFM Inductive Double Sensor IN5225 ✓ IFM Inductive Double Sensor IN5327, NN5002, IN5334 & more
Pneumatic actuators, single-acting and double-acting. FERGO DA & SR series for industrial valves, reliable, robust, and application-ready.
Armaturen aus dem Hause FERGO! Armaturen automatisch steuern? kein Problem! Unsere Kugelhähne und Absperrklappen lassen sich über einen Antrieb extern steuern. Egal ob Sie eine pneumatischen Steuerung (einfa
Switchmaster-M2 Mechanischer Mikroschalter 4V/DC-250V/AC 1mA - 5A IP67 Endschalter
Product number
710-1050
The Switchmaster-M2 mechanical microswitch (4V/DC – 250V/AC 1mA – 5A, IP67 limit switch) is a high-quality solution for industrial piping systems. Materials and seals: Plastic housing (Lexan 143). Further features: Mechanical position feedback OPEN/CLOSED; 0–90° swivel angle; changeover contact function. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply and process applications.
Typ:
Mechanischer Positionsrückmelder AUF/ZU
Switching function:
Wechsler
Spannungsbereich:
4V/DC-250V/AC
Temperature range :
-20°C to +70°C
Protection class :
IP67
Availability:
In Stock
Price €79.55
€94.66 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Switchmaster-N2 Induktiver Sensor Namur EN 60947-5-6 explosion-proof ATEX Endschalter
Product number
710-1052
The Switchmaster-N2 Inductive Sensor Namur EN 60947-5 -6 Explosion-proof ATEX limit switch is a high-quality solution for industrial piping systems. Approvals and standards: ATEX. Further features: Inductive sensor OPEN/CLOSE Namur EN 60947-5 -6; explosion-proof Ex ia IIB T6; 0–90° swivel angle. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply and process applications.
Switching function:
plus schaltend, PNP Schließer, in Endlage bedämpft oder unbedämpft
Typ:
Induktiver Sensor AUF/ZU
Spannungsbereich:
10 - 30V/DC
Temperature range :
-20°C to +70°C
Protection class :
IP67
Availability:
In Stock
Price €220.00
€261.80 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Switchmaster-D2 Induktiver Sensor 10 - 30V/DC IP67 Endschalter
Product number
710-1051
The Switchmaster-D2 Inductive Sensor 10–30V/DC IP67 limit switch is a high-quality solution for industrial piping systems. Materials and seals: Plastic housing (Lexan 143). Further features: Inductive ON/OFF sensor; 0–90° swivel angle; switching function plus switching. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply and process applications.
Switching function:
plus schaltend, PNP Schließer, in Endlage bedämpft oder unbedämpft
Typ:
Induktiver Sensor AUF/ZU
Spannungsbereich:
10 - 30V/DC
Temperature range :
-20°C to +70°C
Protection class :
IP67
Availability:
In Stock
Price €160.00
€190.40 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Endschalterbox EB300-PP2I02
Product number
711-PP2I02
The EB300-PP2I02 limit switch box is a high-quality solution for industrial piping systems. Further features: polyamide mounting bracket and shaft; 2x P+F inductive proximity switches with yellow LED indicators; operating current: 0–100 mA; protection class: IP67; and many other options available on request. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply and process applications.
Switching function:
2x inductive proximity switches P+F, NBB2-V3-E2 (PNP N.O.)
Voltage :
10-30 V DC
Body:
Polyamide (PA6)
Temperature range :
-25°C to +70°C
Protection class :
IP67
Availability:
In Stock
Price €109.60
€130.42 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Endschalterbox EB300-PP2M02
Product number
711-PP2M02
The EB300-PP2M02 limit switch box is a high-quality solution for industrial piping systems. Approvals and standards: SIL. Further features: polyamide mounting bracket and shaft; silver contacts with Cherry mechanical microswitches; operating current: 0. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply and process applications.
Switching function:
Mechanical micro switches Cherry, D44X (SPDT, NO/NC)
Voltage :
12-250 V AC/DC
Body:
Polyamide (PA6)
Temperature range :
-25°C to +80°C
Protection class :
IP67
Availability:
In Stock
Price €55.02
€65.47 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Endschalterbox EB300-PE2M02
Product number
711-PE2M02
The EB300-PE2M02 limit switch box is a high-quality solution for industrial piping systems. Approvals and standards: SIL. Further features: Stainless Steel mounting bracket and shaft; silver contacts with Cherry mechanical microswitches; operating current: 0. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply and process applications.
Switching function:
Mechanical micro switches Cherry, D44X (SPDT, NO/NC)
Voltage :
12-250 V AC/DC
Body:
Polyamide (PA6)
Temperature range :
-25°C to +80°C
Protection class :
IP67
Availability:
In Stock
Price €100.24
€119.29 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Endschalterbox EB300-PE2I02-7
Product number
711-PE2I02-7
The EB300-PE2I02-7 limit switch box is a high-quality solution for industrial piping systems. Further features: Stainless Steel mounting bracket and shaft; yellow LED indicator; current consumption: 0–200 mA; protection class: IP67; and many other options available on request. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply systems and process applications.
Switching function:
Induktive Näherungsschalter IFM, IS5001, 3-Draht PNP
Voltage :
10-30 V DC
Body:
Polyamide (PA6)
Temperature range :
-25°C to +80°C
Protection class :
IP67
Availability:
In Stock
Price €152.69
€181.70 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Endschalterbox EB300-VP2M02-551-ED ATEX
Product number
711-VP2M02-551-ED
The EB300-VP2M02-551-ED limit switch box ATEX is a high-quality solution for industrial piping systems. Approvals and standards: ATEX, SIL. Further features: EB300-VP2M02-551-ED limit switch box with mechanical ATEX switches; Flexible and conductive Vestamid limit switch box; Polyamide mounting bridge and shaft suitable for Ex zones 1+2 and 21+22; 2x Bartec 07-1511-1030 mechanical Ex d switches. The design ensures safe operation, easy integration and reliable performance in everyday industrial use.
Switching function:
2x mechanical Ex d switches Bartec 07-1511-1030, 3-wire NO/NC
Voltage :
24V DC / 250V AC
Body:
Vestamide
Temperature range :
-20°C to +40°C
ATEX:
II 2G Ex de IIC T6 Gb und II 2D Ex t IIIC T80°C Db
Protection class :
IP66
Price €172.52
€205.30 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Endschalterbox EB300-VP2S02-IA ATEX
Product number
711-VP2S02-IA
The EB300-VP2S02-IA limit switch box ATEX is a high-quality solution for industrial piping systems. Approvals and standards: ATEX. Further features: EB300-VP2S02-IA limit switch box with inductive ATEX switches; flexible and conductive Vestamid limit switch box; Polyamide mounting bridge and shaft suitable for Zone 1 and 21 (Ex ia) hazardous areas; 2x inductive slot sensors P+F. The design ensures safe operation, easy integration and reliable performance in everyday industrial use. Suitable for industrial piping systems, plant engineering, technical supply and process applications.
Switching function:
2x inductive slot type sensors P+F, SJ3,5-N, 2-wire Ex ia
Voltage :
8V DC
Body:
Vestamide
Temperature range :
-25°C to +70°C
ATEX:
II 2G Ex ia IIC T6 Gb und II 2D Ex ia IIIC T80°C Db
Protection class :
IP67
Price €188.86
€224.74 incl. VAT Delivery Time: 2–5 Working Days
Available: In Stock
Frequently Asked Questions – Limit Switch Box (Switchmaster)
A limit switch box (also known as a position feedback unit, valve monitor, or – under the FERGO brand name – Switchmaster) is a device mounted on a pneumatic part-turn actuator or electric part-turn actuator that detects the actual position of the process valve (OPEN / CLOSED) and reports it electrically to the control system (PLC/DCS/control room):
- Visual position indicator: The unique Switchmaster design makes the valve position (OPEN/CLOSED) clearly visible from a distance – without any current measurement or screen
- Electrical feedback to PLC/DCS: Switch contacts (mechanical or inductive) signal the control system precisely when the valve has reached the end positions "fully open" and "fully closed" – essential for automated process sequences, interlocks, and alarm functions
- Rotation angle: 0° to 90° – matching all quarter-turn actuators for ball valves, butterfly valves, knife gate valves, and plug valves
- Mounting: Directly on the NAMUR hole pattern of the actuator or the side flange; no additional brackets or adapters required
- Adjustability: Switching points and sensitivity are field-adjustable to compensate for different actuator geometries and mechanical tolerances
The three Switchmaster core models differ in sensor type, voltage range, wear behaviour, and suitability for hazardous areas:
Switchmaster M2 – Mechanical microswitch (standard, non-ATEX):
Switchmaster M2 – Mechanical microswitch (standard, non-ATEX):
- Sensor: Mechanical microswitch; switching function: change-over contact (NO + NC simultaneously) – maximum wiring flexibility with a single switch element
- Voltage range: 4V DC – 250V AC; current range: 1mA – 5A; gold-plated contacts (corrosion-resistant; reliable at milliamp signal levels)
- Protection: IP67; housing: Lexan 143 plastic, antistatic coating; temperature: −20°C to +70°C
- Choose M2 when: Standard industrial applications without ATEX requirement; wide voltage compatibility (24V DC to 230V AC); applications needing very low control currents (from 1mA) or higher load currents (up to 5A); wherever a change-over contact is needed for both NO and NC wiring without rewiring
- Sensor: Inductive proximity switch; switching function: PNP NO contact; contactless operation – no mechanical wear
- Voltage range: 10–30V DC; current: max. 100mA; switching function: damped or undamped in end position
- Protection: IP67; housing: Lexan 143, antistatic; temperature: −20°C to +70°C
- Choose D2 when: 24V DC PLC-controlled plant (PNP outputs); high switching frequency; wet or vibrating environments where mechanical contacts would wear; no ATEX requirement and 24V DC available
- Sensor: Inductive sensor per NAMUR EN 60947-5-6; 2-wire; damped/undamped in end position
- Nominal voltage: 8V DC (max. 16V DC); output current: damped <1mA, undamped >3mA; max. switching capacity: 34mW
- Protection: IP67; housing: Lexan 143; temperature: −20°C to +70°C
- ATEX marking: II 2 G Ex ia IIB T6 → Zone 1 (gas) and Zone 21 (dust); supply from certified intrinsically safe circuit (Zener barrier or galvanic isolator)
- Choose N2 when: ATEX Zone 1, Zone 2, Zone 21, or Zone 22; plant with NAMUR-compatible evaluation units (barriers/isolators); where intrinsically safe circuits are required by the area classification
The EB300 series is a modular, flexible limit switch box in polyamide (PA6) with polycarbonate cover or conductive vestamide housing for ATEX applications. Unlike the Switchmaster SM housing (Lexan 143), the EB300 has an interchangeable mounting bracket, shaft, and sensor configuration:
EB300-PP2M02 – Mechanical microswitches, standard:
EB300-PP2M02 – Mechanical microswitches, standard:
- 2× Cherry mechanical microswitches; PA6 housing + PC cover; polyamide bracket and shaft; 12–250V AC/DC; IP67
- Use: Standard industrial environments without ATEX; wide voltage range
- 2× Pepperl+Fuchs NBB2-V3-E2 inductive PNP NO; yellow LED indicator; PA6 + PC cover; polyamide bracket and shaft; max. 100mA; IP67
- Use: 24V DC PLC plants; contactless position detection
- 2× Cherry mechanical microswitches; PA6 + PC cover; stainless steel mounting bracket and shaft (enhanced corrosion resistance); 0.1–10A; IP67
- Use: Corrosive environments; offshore; chemical plants; where standard plastic bracket is insufficient
- 2× Bartec 07-1511-1030 mechanical Ex d switches; 3-wire changeover with silver contacts; conductive vestamide housing (electrostatic dissipative); polyamide bracket and shaft; ATEX Zone 1+2 and Zone 21+22; IP66
- Use: Ex d (flameproof enclosure) for Zone 1 gas + Zone 21 dust; most robust ATEX option
- 2× Pepperl+Fuchs SJ3,5-N inductive slot sensors; 2-wire Ex ia; conductive vestamide housing; Zone 1 and Zone 21; IP67
- Use: Intrinsically safe version for Zone 1 / Zone 21; NAMUR-compatible evaluation unit required
Both technologies are proven; the right choice depends on the application:
Mechanical microswitch (SM-M2, EB300-PP2M02, EB300-PE2M02):
Mechanical microswitch (SM-M2, EB300-PP2M02, EB300-PE2M02):
- Advantages:
- Universal voltage range 4V DC to 250V AC – compatible with virtually any control system without voltage converters
- Change-over contact (NO + NC simultaneously) – maximum wiring flexibility in a single switch element
- Very low switching currents (from 1mA) – compatible with electronic PLC inputs with minimal hold current requirements
- Higher load currents (up to 5A or 10A for PE2M02) – direct motor contactor control without interposing relays
- Robust and low-maintenance; no external supply voltage required for the sensor itself
- Disadvantages: Mechanical contact wear; limited switching frequency (typically ≤50 Hz sustained); sensitive to vibration and moisture if inadequately protected
- Advantages:
- Contactless – no mechanical wear; unlimited theoretical switching frequency
- Immune to moisture, dust, and vibration (no moving parts in the sensing zone)
- Fast switching times; precise, repeatable switching points
- ATEX-capable: NAMUR version (SM-N2, EB300-VP2S02-IA) for Zone 1/21 with intrinsically safe supply; PNP version suitable for Zone 2/22 with appropriate housing
- Disadvantages: Narrow voltage range (24V DC for PNP; 8V DC for NAMUR); separate supply voltage required for the sensor; no true change-over contact (PNP has NO only; NAMUR is 2-wire with defined current threshold)
In hazardous areas (ATEX zones) all electrical equipment – including limit switch boxes – must be approved for the relevant zone. FERGO offers several ATEX versions:
Switchmaster N2 – Ex ia IIB T6 (Zone 1 / Zone 21):
Switchmaster N2 – Ex ia IIB T6 (Zone 1 / Zone 21):
- Protection level: Intrinsic safety (Ex ia) – no ignitable energy under up to two simultaneous faults; highest safety level
- ATEX marking: II 2 G Ex ia IIB T6; gas group IIB (H₂, ethylene, town gas etc.); temperature class T6 (max. 85°C surface temperature)
- Supply: Exclusively from a certified intrinsically safe circuit (Zener barrier or galvanic isolator)
- Suitable for: Zone 1+2 (gas) and Zone 21+22 (dust)
- Protection level: Flameproof enclosure (Ex d) – any internal ignition is contained and cannot propagate outside
- Bartec mechanical switches; conductive vestamide housing; IP66; Zone 1+2 and Zone 21+22
- Suitable for: Applications where mechanical switch contacts (no external sensor supply) are preferred and Zone 1 is present
- P+F inductive slot sensors Ex ia; conductive vestamide housing; 2-wire; IP67
- Suitable for: Zone 1 and Zone 21 with intrinsically safe circuit; contactless position detection in hazardous areas
Mounting the FERGO limit switch boxes (Switchmaster SM and EB300 series) is standardised and requires minimal tools:
Mounting:
Mounting:
- The limit switch box mounts directly on the NAMUR hole pattern of the part-turn actuator (VDI/VDE 3845) or on the side flange of the actuator – no external brackets or adapters are required when the actuator has the NAMUR hole pattern (all FERGO actuators do)
- The actuator output shaft engages the coupling shaft of the limit switch box; the cam discs inside the box rotate with the valve shaft and actuate the switches at the end positions
- All FERGO actuators carry the NAMUR hole pattern – all Switchmaster models mount directly without special tools
- Inside the limit switch box are adjustable cam discs (SM series) or adjustable actuating flags (EB300 series) that can be freely positioned within the 0–90° rotation range
- Commissioning sequence: Drive valve to CLOSED end position → adjust CLOSED cam to trigger → drive valve to OPEN end position → adjust OPEN cam to trigger → verify with PLC feedback
- The unique visual indicator of the Switchmaster (red/green display bar visible from a distance) gives immediate optical position confirmation during commissioning, before the PLC wiring is complete
The limit switch box provides electrical output signals compatible with standard PLC input cards, with the signal type depending on the model:
SM-M2 (mechanical, change-over):
SM-M2 (mechanical, change-over):
- 2 switches for OPEN end position and 2 switches for CLOSED end position; each switch provides NO + NC (change-over) → 4 freely wirable contacts total
- Typical PLC wiring: NO contact → PLC input "valve OPEN confirmed" / "valve CLOSED confirmed"; NC contact → PLC input for alarm "end position not reached" (with stroke time monitoring)
- 2× PNP NO contacts for OPEN and CLOSED end positions; 24V DC; direct connection to PLC digital inputs (PNP-compatible) without interposing relays
- 2× NAMUR signal outputs; evaluation via Zener barrier or galvanic isolator; NAMUR standard EN 60947-5-6 (damped <1mA = switch actuated; undamped >3mA = switch open)
- Evaluation unit converts NAMUR signal to 24V DC PLC-compatible signal
- Stroke confirmation: After a positioning command (OPEN or CLOSE), the PLC waits for confirmation from the limit switch box within a defined stroke time; if confirmation does not arrive → alarm "stroke monitoring" or "actuator blocked"
- Process interlocks: Other plant sections can only start once the valve is safely in its end position (e.g. pump start only permitted when butterfly valve is fully open)
- Status visualisation: Valve position displayed in SCADA/DCS operator screens as green (OPEN) / red (CLOSED) / yellow (in motion / fault)
- SIL requirements: In safety-instrumented systems (SIL 1–3), valve position feedback is an essential element of the safety function; ATEX N2 version and redundant wiring per IEC 61508/61511
Yes – the limit switch box is a standard module in the FERGO automation package, which can be supplied factory-assembled and tested as a complete unit on the process valve. The typical configuration of a complete automated valve assembly:
- Process valve (butterfly valve, ball valve, knife gate valve etc.) with ISO 5211 actuator mounting flange
- Pneumatic part-turn actuator (DA or SA), direct-mounted on the ISO 5211 flange
- NAMUR solenoid valve (3/2 or 5/2), mounted on the NAMUR hole pattern of the actuator
- Limit switch box (Switchmaster), also mounted on the NAMUR hole pattern or side flange
- Optional: Inductive sensor (IFM series) as an alternative to the limit switch box for contactless IO-Link position detection
- Factory-aligned and function-tested – correct switching point setting and torque verification before dispatch
- All components mechanically and electrically matched – no incompatibilities in flange dimensions, torque ratings, or interfaces
- Minimum on-site installation time: one unit, four bolts, one air line, one cable set
- Unified documentation: one data sheet package and one CE declaration of conformity for the complete assembly