ABB NFZB31EK-21: A reliable contact relay for railway applications, ensuring efficient switching and high reliability. Compliant with IEC 60947-5-1 and IEC 60077 standards.
Product ModelNFZB31EK-21
Material Number1SBH136063R2131
Product ID85418
Stock on Request
Last updated: 8/29/2026
Key Features
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Feature1. Compliance with Railway Standards \"Meets all main general and rolling stocks standards: IEC 60947-5-1 and the applicable parts of IEC 60077-1/-2 and EN 50155.\" This ensures the NFZB31EK-21 is perfectly suited for frequent use in passenger and driver cabins, especially in tunnels or undergrounds.
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Feature2. Fast Wiring and Installation \"Includes Push-in Spring terminals for extremely fast wiring: faster than ever installation, easier than ever wiring, reliable as ever connections.\" This feature makes the NFZB31EK-21 a time-saving solution for your railway operations.
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Feature3. Compact Design \"Improves the compactness of the installations thanks to reduced dimensions and side-by-side mounting requiring less 15% width (without spacing) from -40 °C up to +70 °C.\" The NFZB31EK-21 is designed to save space, making it ideal for modern train cabins.\",\"4. High Reliability and Fire Safety \"Reaches the highest levels in fire and smoke behaviour with compliance to European standard EN 45545-2 (HL2, HL3 hazard levels).\" This ensures that the NFZB31EK-21 not only operates reliably but also meets stringent fire safety standards.\",\"5. Energy Efficiency \"Reduces train energy with lighter devices and requiring 68% less coil energy consumption in operation.\" The NFZB31EK-21 is designed to minimize energy consumption, contributing to a more sustainable and efficient railway operation.
Technical Specifications
Detailed engineering parameters based on manufacturer documentation
Specifications may be subject to change without notice
Parameter
Value
Parameter
Value
Product Net Width
45 mm
Product Net Depth / Length
77 mm
Product Net Height
92.3 mm
Product Net Weight
0.315 kg
Number of Auxiliary Contacts NO
3
Number of Auxiliary Contacts NC
1
Standards
IEC/EN 60947-1, IEC/EN 60947-5-1, UL 60947-5-1, CSA C22.2 No. 60947-5-1, IEC 60077-1 (applicable parts), IEC 60077-2 (applicable parts), EN 50155 (applicable parts), TR CU 001/2011, IEC 61373, For compliance confirmation on applicable parts based on your application and combination, please consult your ABB sales representatives.
Rated Operational Voltage
Auxiliary Circuit 690 V Main Circuit 690 V
Rated Frequency (f)
Auxiliary Circuit 50 / 60 Hz Control Circuit 50 / 60 Hz Main Circuit 50 / 60 Hz
Conventional Free-air Thermal Current (Ith)
acc. to IEC 60947-5-1, Π= 40 °C 16 A
Rated Operational Current AC-15 (Ie)
(500 V) 2 A (690 V) 2 A (24 / 127 V) 6 A (220 / 240 V) 4 A (400 / 440 V) 3 A
Rated Short-time Withstand Current Low Voltage (Icw)
for 0.1 s 140 A for 1 s 100 A
Maximum Electrical Switching Frequency
(AC-15) 1200 cycles per hour (DC-13) 900 cycles per hour
Rated Operational Current DC-13 (Ie)
(24 V) 6 A / 144 W (48 V) 2.8 A / 134 W (72 V) 1 A / 72 W (110 V) 0.55 A / 60 W (125 V) 0.55 A / 69 W (220 V) 0.27 A / 60 W (250 V) 0.27 A / 68 W (400 V) 0.15 A / 60 W (500 V) 0.13 A / 65 W (600 V) 0.1 A / 60 W
Rated Insulation Voltage (Ui)
acc. to IEC 60947-5-1 690 V acc. to UL/CSA 600 V
Rated Impulse Withstand Voltage (Uimp)
6 kV
Maximum Mechanical Switching Frequency
6000 cycles per hour
Rated Control Circuit Voltage (Uc)
50 Hz 24 ... 60 V 60 Hz 24 ... 60 V DC Operation 20 ... 60 V
Operate Time
Between Coil De-energization and NC Contact Closing 13 ... 98 ms Between Coil De-energization and NO Contact Opening 11 ... 95 ms Between Coil Energization and NC Contact Opening 38 ... 90 ms Between Coil Energization and NO Contact Closing 40 ... 95 ms
Mounting on DIN Rail
TH35-15 (35 x 15 mm Mounting Rail) acc. to IEC 60715 TH35-7.5 (35 x 7.5 mm Mounting Rail) acc. to IEC 60715
acc. to IEC 60529, IEC 60947-1, EN 60529 Auxiliary Terminals IP20 acc. to IEC 60529, IEC 60947-1, EN 60529 Coil Terminals IP20
Terminal Type
Push-in Spring Terminals
Connecting Capacity Auxiliary Circuit UL/CSA
Rigid Solid 1/2x 18-14 AWG
Connecting Capacity Control Circuit UL/CSA
Rigid Solid 1/2x 18-14 AWG
Ambient Air Temperature
Close to Contactor for Storage -60 ... +80 °C Near Contactor for Operation in Free Air -40 ... 70 °C Near Contactor for Operation in Free Air (0.85 ... 1.1 Uc) -40 ... +60 °C Near Contactor for Operation in Free Air (Uc) -40 ... 70 °C
Climatic Withstand
Category B according to IEC 60947-1 Annex Q
Maximum Operating Altitude Permissible
Without Derating 3000 m
Resistance to Vibrations
4g Closed Position & 2g Open position 5 ... 300 Hz
