HELLA 4RA 931 774-031 12V 4-pin solid-state relay
HELLA 4RA 931 774-031 is a 12V 4-pin solid-state main current relay developed for demanding automotive applications where reliability, high switching frequency and compact construction are required. The relay is typically used in electrical systems for items such as fan motors, glow plugs, headlamps and heating systems, where traditional mechanical relay control is not always the best solution.
The relay is designed as a normally open relay with 1 Form A / SPST N/O contact function and is intended for pulsation-controlled loads. As a solid-state relay, it operates without mechanical contact parts in the same way as a traditional relay, providing quiet operation, high switching stability and long service life under repeated load.
The sealed construction with IP67 protection makes the relay suitable for installation in demanding environments where it may be exposed to moisture, dust and temperature fluctuations. The relay is also built without a mounting bracket and is supplied with a 4-pin Plug Type B connection, making it relevant for both replacement and custom-built applications where space and mounting style matter.
HELLA 4RA 931 774-031 is rated for continuous current up to 22A and has overload protection up to 80A. It is also designed to operate at temperatures from -40°C to +125°C and can work with switching frequencies up to 1000 Hz. The relay is also described as resistant to short circuit, overload, reversed polarity and earth disconnection, making it suitable for demanding vehicle electrical installations.
Specifications
Manufacturer: HELLA
Part number: 4RA 931 774-031
Type: Solid-state relay / main current relay
Voltage: 12V
Number of pins: 4
Connector type: 4-pin Plug Type B
Contact function: Normally open, 1 Form A / SPST N/O
Operating mode: Pulsation-controlled
Protection class: IP67
Switching frequency: Up to 1000 Hz
Operating temperature: -40°C to +125°C
Max. continuous current: Up to 22A
Load at 25°C: 18A
Load at 105°C: 12A
Overload protection: 80A
Mounting: Without mounting bracket
Features: Quiet operation, high switching stability, compact design
Replaces / cross references
Mercedes-Benz: A 002 542 48 19, 002 542 48 19
VW: 990 002 047
Ford: 9M6T-14N135-AA
Jaguar: 02C2C6786
AGCO: 700727079
Other numbers: HELLA 4RA007865-031, WÜRTH X04142
