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80A 4kV Dielectric Smart Meter Latching Relay GRT508FA AgSnO2

Product Summary

The GRT508FA switches up to 80A resistive load at 250VAC through AgSnO2 contacts, holds its contact position after a short impulse, and needs no continuous coil power to stay latched. Coil options run from 5 to 24 VDC, available for both single coil and double coil excitation. The relay measures 39.1 x 31.9 x 17 mm, provides 4kV dielectric strength between coil and contacts, and is rated for a maximum short-circuit current of 1800A/10ms. Fast connection terminals suit meter assembly lines, and custom versions with flexible wire, copper straps or an integrated shunt can be supplied on request.

Key Features

• 80A switching capability with AgSnO2 contacts at up to 250VAC resistive load, plus 1800A/10ms maximum short-circuit current, supporting main-circuit switching in metering designs.
• Impulse excitation only, single or double coil, so the contact state is maintained after switching without continuous coil supply, keeping drive-circuit consumption low.
• 4kV dielectric strength between coil and contacts, giving control-to-load isolation for meter electronics.
• 100,000 operations mechanical endurance and 6,000 operations electrical endurance at 80A 250VAC (10,000 operations at 60A 250VAC) for predictable service-life planning.
• Compact 39.1 x 31.9 x 17 mm outline with fast connection terminals for space-constrained meter housings.
• Certified for EU metering projects: UC2 by TUV Rheinland (AK 50234055 0001) to IEC 62055-31:2005 and EN 62055-31:2005, CE certificate TTC-23-1307/02/04, CQC 9001036713, and RoHS compliance.

Technical Specifications

Models and Options

The GRT508FA series covers the 80A 1-pole configuration described on this page. Buyers specify the coil voltage within the 5-24 VDC range and choose single coil or double coil impulse excitation according to the meter drive circuit. Coil voltage other than the listed range, alternative contact arrangements and assembly-level customization are quoted against the application drawing.

Materials and Structure

Contacts are made of AgSnO2 for arc resistance under resistive switching duty, and the housing is built from copper and plastic components. The relay is a 1-pole latching design in which a short impulse sets or resets the contact position, which then remains latched. Fast connection terminals allow quick wiring on the meter assembly line, and the 39.1 x 31.9 x 17 mm body fits standard meter board layouts. Four images of the GRT508FA are shown below.

Applications

The GRT508FA is used for on-off control of energy meter circuits, for energy measurement modules, and for latching control in smart home equipment. Its UC2 certification covers use as a relay for electricity metering payment systems, which includes prepaid meter designs. Typical working conditions are an ambient temperature of -40℃ to +85℃, relative humidity of 5% to 85%RH non-condensing, altitude up to 2000m, and surroundings free of corrosive gas or explosive dust, under resistive load. These conditions suit indoor metering cabinets and measurement assemblies.

Customization

As a custom latching relay platform, the GRT508FA can be supplied as a custom assembly with flexible wire and/or copper straps, and/or with an integrated shunt. Coil voltage selection within 5-24 VDC and single or double coil excitation are specified at order. Custom builds are quoted after review of the requested wire length, strap geometry or shunt value, since those are application-specific and not held as catalogue items.

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