GRT508FA3B relay core supplied for wire, copper strap or shunt assembly.
Three contact sets with fast connection terminals, base for strap termination.
Product Summary
This configuration starts from the GRT508FA3B 80A three-pole latching relay and adds factory assembly work: flexible wire leads, copper straps, an integrated shunt, or a combination of these. The relay core keeps its metering ratings, 80A resistive at up to 380VAC, a 5-24 VDC impulse coil and 4kV coil-to-contact dielectric strength, while termination and current-sensing parts are matched to the meter or metering module drawing. The assembly is aimed at buyers who want to remove manual wiring and shunt mounting from their own line.
Key Features
Assembly-level customization. Flexible wire and/or copper straps and/or an integrated shunt are added to the 80A relay, so one part number covers switching plus connection and sensing.
80A rated load retained. Three contact sets, 80A resistive at max switching voltage 380VAC, unchanged by the assembly work.
Integrated shunt option. Current sensing is built into the same assembly instead of a separate component on the board.
Impulse-driven latching. State is held after each pulse without continuous coil power, with coil voltage selectable in the 5-24 VDC range.
4kV coil-to-contact isolation. Control and load circuits stay separated, with short-circuit withstand of 2500A/10ms and 4500A/10ms without explosion.
Compact relay body of 98 x 40.8 x 36 mm. Fast connection terminals, AgSnO2 contacts, rated from -40 to +85 degrees C.
Technical Specifications
Base model
GRT508FA3B, 3-pole magnetic latching relay
Rated load (resistive)
80A
Max. switching current / voltage
80A / 380VAC
Coil voltage
5-24 VDC, single coil or double coil, impulse excitation only
Flexible wire, copper straps, integrated shunt, or combined
Assembly outline
Defined against the customer drawing; wire length, strap shape and shunt position agreed per project
Compliance / certification
RoHS compliant; IEC 62055-31 UC2 compliant; CQC14002115926 (GB/T21711.1-2023); TUV Rheinland UC2, cert AK 50255817 0001 (IEC 62055-31:2005, EN 62055-31:2005)
Models and Options
Relay core: GRT508FA3B, three-pole, 80A, fast connection.
Wire option: flexible wire leads assembled to the relay terminals.
Strap option: copper straps for high-current connection.
Shunt option: integrated shunt in the same assembly.
Combinations of wire, straps and shunt, plus single or double coil drive in the 5-24 VDC range.
Materials and Structure
The relay uses AgSnO2 contacts, copper conductive parts and a plastic housing, with three contact sets and fast connection terminals in a 98 x 40.8 x 36 mm body. In the custom version, flexible wire leads, copper straps and an integrated shunt are added to the terminals as a factory assembly. The magnetic latching structure holds the last position after an impulse, so no continuous coil current is needed. Assemblies are specified for resistive load, PCB soldering or screw mounting, 5-85% relative humidity non-condensing, and altitude up to 2000 m.
Applications
For metering builds that prefer a pre-wired switching block: three-phase smart electricity meters including State Grid three-phase meters, prepaid meters, and energy measurement modules where the relay, its cable harness and the current-sensing shunt are mounted as one unit, plus smart home switching modules needing a latching contact.
Customization
Choose wire, copper strap, integrated shunt, or any combination of the three.
Select coil voltage inside 5-24 VDC and single or double coil drive.
Send the assembly drawing so wire length, strap geometry and shunt position can be confirmed before quotation.
FAQ
What exactly can be customized on this relay assembly?
Flexible wire, copper straps and an integrated shunt, used individually or combined, on the GRT508FA3B 80A three-pole latching relay.
Do the electrical ratings change when the assembly is customized?
The relay core keeps 80A resistive rated load, 380VAC maximum switching voltage, 80A maximum switching current and 4kV coil-to-contact dielectric strength.
What do I need to provide for a custom assembly quotation?
The assembly drawing, the option combination required (wire, strap, shunt), coil voltage within 5-24 VDC and single or double coil drive. Price, MOQ and lead time are confirmed in the quotation.
Which certifications apply to the base relay?
CQC14002115926 against GB/T21711.1-2023 for the GRT508FA-3B series and TUV Rheinland UC2 certificate AK 50255817 0001 against IEC 62055-31:2005 and EN 62055-31:2005; the relay is RoHS compliant.
How is the switched state maintained?
Only impulse excitation is needed; the contacts hold their position after the pulse, so the coil is not powered continuously.
What are the mounting and environment limits?
Fast connection terminals on the relay, PCB soldering or screw mounting in the meter, -40 to +85 degrees C, 5-85% relative humidity non-condensing and altitude up to 2000 m.
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