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1SBH137063R1431 ABB NFB31EK-14 Contactor 250-500V AC/DC Coil
ABB NFB31EK-14 is a 4-pole railway contactor relay with 3 NO and 1 NC contacts, Push-in Spring terminals and a 250–500 V AC/DC control voltage range for reliable switching of auxiliary and control circuits in rolling stock.
£83.57
Why Choose the ABB NFB31EK-14 Contactor Relay?
The ABB NFB31EK-14, order code 1SBH137063R1431, is a compact 4-pole contactor relay designed for switching auxiliary and control circuits in railway rolling stock and demanding industrial applications. As part of the ABB NFB railway contactor relay range, it is designed to meet key rolling-stock requirements and is suitable for installation in passenger or driver compartments of trains operating frequently in tunnels or underground environments.
The NFB31EK-14 features 3 normally open and 1 normally closed contacts together with an electronic coil interface covering a wide 250–500 V AC 50/60 Hz and 250–500 V DC control voltage range. Integrated surge suppression eliminates the need for an additional external surge suppressor, while the low holding power of 1.7 W supports energy-efficient control-circuit operation.
With Push-in Spring connection technology, mechanically linked auxiliary contacts and a rated switching current of 4 A, the NFB31EK-14 provides dependable switching for railway control and signalling circuits. Its compact 45 mm width, 92.3 mm height and 77 mm depth support space-efficient installation in railway control cabinets and electrical panels.
Key Advantages
- Compact 4-pole contactor relay designed for railway rolling stock.
- 3 NO and 1 NC contact configuration for flexible auxiliary and control circuits.
- Wide 250–500 V AC/DC control voltage range.
- Push-in Spring terminals support fast and dependable wiring.
- Integrated surge suppression eliminates the need for additional coil suppression components.
- Designed to meet demanding shock, vibration, fire and smoke requirements for railway applications.
Key Features
- ABB NFB railway contactor relay series.
- 4-pole configuration with 3 NO and 1 NC contacts.
- 250–500 V AC 50/60 Hz control voltage.
- 250–500 V DC control voltage.
- 4 A rated switching current.
- 1.7 W holding power.
- Mechanically linked auxiliary contacts with built-in surge protection.
- Push-in Spring terminals for efficient control-panel wiring.
Reliable Control Circuit Switching for Railway Applications
Contactor relays such as the ABB NFB31EK-14 switch auxiliary and control circuits used throughout railway electrical systems. Its three normally open and one normally closed contacts provide flexibility for signalling, interlocking and control functions, while mechanically linked contacts support dependable operation in demanding control architectures.
The NFB range is engineered for rolling-stock environments and meets key requirements including IEC 60947-4-1, IEC 60947-5-1 and IEC 60077-1/-2. Shock and vibration resistance according to IEC 61373 Category 1, Class B, together with EN 45545-2 HL2 fire and smoke performance, makes the NFB31EK-14 suitable for demanding railway installations.
Typical Applications
- Railway rolling stock control systems.
- Train passenger and driver compartments.
- Auxiliary and signalling circuits.
- Rail vehicle electrical control cabinets.
- Interlocking and automation circuits.
- Railway machinery and onboard electrical equipment.
Technical Specifications
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| Terminal Type | Push-in | |
|---|---|---|
| Coil Type | AC, AC/DC, DC | |
| Coil Voltage Range | 200–250 V, 380–440 V, 460–500 V | |
| Poles | 4-pole | |
| Device Type | Contactor relay | |
| Auxiliary Contacts | 3NO + 1NC | |
| Manufacturer | ABB | |
| Series | NFB | |
| Model | NFB31EK-14 | |
| Order code | 1SBH137063R1431 | |
| EAN / GTIN | 3471523009806 | |
| Product type | Contactor relay | |
| Number of poles | 4 | |
| Auxiliary contacts | 3 NO + 1 NC | |
| Control voltage, AC | 250–500 V AC, 50/60 Hz | |
| Control voltage, DC | 250–500 V DC | |
| Rated operational voltage, auxiliary circuit | 690 V AC | |
| Rated switching current | 4 A | |
| Rated operational current at 400 V | 3 A | |
| Holding power | 1.7 W | |
| Terminal type | Push-in Spring terminals | |
| Mounting type | DIN rail / screw mounting | |
| Shock and vibration standard | IEC 61373 Category 1, Class B | |
| Fire and smoke standard | EN 45545-2, HL2 | |
| Dimensions (H × W × D) | 92.3 × 45 × 77 mm | |
| Weight | 0.325 kg |
Frequently Asked Questions
What is the ABB NFB31EK-14 used for?
The NFB31EK-14 is a contactor relay designed for switching auxiliary and control circuits in railway rolling stock and other demanding electrical control applications.
How many contacts does the ABB NFB31EK-14 have?
The NFB31EK-14 is a four-pole contactor relay with 3 normally open contacts and 1 normally closed contact.
What control voltage does the NFB31EK-14 require?
The NFB31EK-14 operates across a wide 250–500 V AC 50/60 Hz and 250–500 V DC control voltage range.
What type of terminals does the ABB NFB31EK-14 use?
The NFB31EK-14 uses Push-in Spring terminals for fast and reliable control-circuit connections.
Is the NFB31EK-14 suitable for railway applications?
Yes. The NFB31EK-14 is designed for railway rolling stock and meets key requirements including IEC 60077-1/-2, shock and vibration resistance according to IEC 61373 Category 1, Class B, and EN 45545-2 HL2 fire and smoke performance.
Trusted ABB Railway Control Technology
ABB NFB contactor relays combine wide-range electronic coil technology, mechanically linked contacts, railway-qualified construction and efficient Push-in Spring connections for dependable auxiliary and control-circuit switching in modern rolling stock.
