80A 3-Pole Latching Relay for Three-Phase Smart Meters GRT508FA3B
SEO Title80A 3-Pole Latching Relay for Three-Phase Smart Meters GRT508FA3B
Meta DescriptionGRT508FA3B is an 80A three-pole latching relay for three-phase smart meters with 4kV coil-contact isolation, IEC 62055-31 UC2 and CQC certification.
GRT508FA3B, 3 x 80A contact sets, fast connection terminals.
Compact 98 x 40.8 x 36 mm body for three-phase meter enclosures.
Product Summary
The GRT508FA3B is a three-pole magnetic latching relay rated 80A resistive at up to 380VAC, built for three-phase smart electricity meters and prepaid metering boards. Three contact sets switch inside one 98 x 40.8 x 36 mm housing, and the bistable magnetic drive holds the contact position after a single impulse, so the coil draws no continuous current. Coil-to-contact dielectric strength is 4kV. The relay is certified by TUV Rheinland to IEC 62055-31 UC2 and by CQC to GB/T21711.1-2023.
Key Features
80A across three contact sets. Rated load 80A resistive, max switching current 80A at max switching voltage 380VAC, so one relay carries the three-phase switching path.
4kV dielectric strength between coil and contacts. Separates the 5-24 VDC control side from the 380VAC load side in meter designs.
Impulse excitation only. One pulse sets or resets the contacts and the state is held without continuous coil power, keeping drive consumption low.
Short-circuit withstand of 2500A/10ms and 4500A/10ms. The relay withstands both levels without explosion.
AgSnO2 contacts. 100,000 mechanical operations and 6,000 electrical operations at 80A 250VAC (10,000 operations at 60A 250VAC).
Fast connection terminals, -40 to +85 degrees C. Small body, wiring-ready terminals for meter assembly lines.
CQC14002115926 (GB/T21711.1-2023, valid to 2029-06-05); TUV Rheinland UC2, cert AK 50255817 0001 (IEC 62055-31:2005, EN 62055-31:2005)
Models and Options
GRT508FA3B: three-pole, 80A, fast connection terminals.
Coil voltage selectable across the 5-24 VDC range.
Drive configurable as single coil or double coil; both use impulse excitation only.
Assembly-level options with flexible wire and/or copper straps and/or an integrated shunt are available as a separate configuration.
Materials and Structure
Contacts are AgSnO2 and conductive parts are copper, assembled in a plastic housing. Three contact sets sit in one 98 x 40.8 x 36 mm body with fast connection terminals. The magnetic latching structure mechanically holds the last switched position after each impulse, so continuous coil energisation is not required. For metering projects the relay is applied under resistive load with PCB soldering or screw mounting, at 5-85% relative humidity non-condensing and altitude up to 2000 m.
Applications
Pulse-driven on-off control of energy meter circuits, where the switched state must be maintained without continuous coil supply. Typical use: three-phase smart electricity meters including State Grid three-phase meters, prepaid meters, energy measurement modules, and smart home switching modules that require a latching contact.
Customization
Custom assemblies are available with flexible wire and/or copper straps and/or an integrated shunt. The coil voltage is specified within the 5-24 VDC range at order stage.
FAQ
What is the rated switching capacity of the GRT508FA3B?
80A resistive rated load, 80A maximum switching current and 380VAC maximum switching voltage.
Is it a single-coil or double-coil relay?
Both drive versions are supported. Only impulse excitation is needed in either case, and the contact state is retained afterwards.
Which certifications does this relay hold?
CQC14002115926 against GB/T21711.1-2023 (issued 2024-06-06, valid to 2029-06-05) 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.
Why are there two electrical endurance figures?
Endurance depends on the switched current: 10,000 operations at 60A 250VAC and 6,000 operations at 80A 250VAC.
What short-circuit current can it withstand?
2500A/10ms and 4500A/10ms, in both cases without explosion.
What is the coil voltage range and mounting?
Coil voltage 5-24 VDC; installation form is fast connection, applied with PCB soldering or screw mounting depending on the meter design.
How do I request a quotation or drawing?
Contact the sales team with your coil voltage, single or double coil preference and annual volume; price, MOQ and lead time are confirmed in the quotation.
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