80A 3-Pole Smart Meter Latching Relay with 4KV Dielectric Strength
SEO Title80A 3-Pole Latching Relay for Smart Meters, IEC62055-31 UC2
Meta DescriptionGRT508M 3-pole latching relay switches three 80A contacts at once. 5-24VDC coil, 4KV dielectric strength, IEC62055-31 UC2 and RoHS compliant for smart meters.
GRT508M 3×80A — front view, fast connection terminalsGRT508M 3×80A — contact side, 100 × 53 × 21 mm body
Product Summary
The GRT508M is a 3-pole latching relay developed for smart metering and prepaid metering circuits. Three sets of contacts switch simultaneously at a rated resistive load of 80A, while the coil only needs an impulse to change state — the relay then holds its position without continuous power. A 5–24 VDC coil, 4KV dielectric strength between coil and contacts, and IEC62055-31 UC2 compliance make it suitable for meter designs that must remain stable over years of service. The body measures 100 × 53 × 21 mm and the relay is installed by fast connection.
Key Features
Three 80A contacts switch togetherOne impulse drives three contact sets at the same time, so a meter can control multi-phase circuits with a single component instead of three separate relays.
Impulse excitation only, single or double coilThe relay holds state with no holding current, which supports low coil power consumption in battery-backed and prepaid meter designs.
4KV dielectric strength coil to contactsProvides isolation between the control side and the 380VAC switching side in meter assemblies.
Short-circuit withstand without explosionTested at 2500A/10ms and 4500A/10ms, giving designers headroom for fault conditions in metering circuits.
IEC62055-31 UC2 and RoHS compliantDocumented compliance matching the standards and material requirements typically requested by European and Indian meter makers.
Optional auxiliary contactAn auxiliary contact can be added for status feedback within the same footprint.
Technical Specifications
Rated Load (resistive)
80A
Poles
3-pole, three contact sets switching simultaneously
Contact Material
AgSnO2
Max. Switching Current
80A
Max. Switching Voltage
380VAC
Coil Voltage
5–24 VDC
Dielectric Strength (coil to contacts)
4KV
Mechanical Endurance
100,000 operations
Electrical Endurance
10,000 OPS (60A 250VAC) / 6,000 OPS (80A 250VAC)
Max. Short-Circuit Current
2500A/10ms & 4500A/10ms (no explosion)
Ambient Temperature
-40°C to +85°C
Installation Form
Fast connection
Outline Dimensions
100 × 53 × 21 mm
Materials
Copper / plastic
Compliance
RoHS compliant; IEC62055-31 UC2 compliant
Models and Options
The GRT508M is built around the 3 × 80A configuration. Within that frame, buyers select the coil drive and the connection interface for their meter platform:
Coil drive: single-coil or double-coil latching, both driven by impulse excitation.
Coil voltage: any nominal value from 5 to 24 VDC.
Contact set: standard three contact sets, with an auxiliary contact available as an addition.
Termination: fast connection as standard, or custom assemblies with flexible wire, copper straps, or an integrated shunt.
Materials and Structure
Contacts are made of AgSnO2, a silver-tin-oxide material chosen for resistive switching duty at 80A. The housing and internal insulation are plastic, with copper used for the current-carrying parts. The three contact groups are mechanically linked so that one coil impulse moves all three at once, and the latching mechanism keeps that position after the pulse ends. The 100 × 53 × 21 mm outline and fast-connection terminals are dimensioned for mounting inside meter enclosures.
Applications
Smart electricity meters: on-off control of meter circuits with low consumption after switching.
Energy measurement modules: pulse-driven switching that maintains state without continuous supply.
Prepaid meter latching relay designs: impulse-driven connect and disconnect of the consumer circuit.
Smart home latching relay configurations: state-holding switching where coil power must be minimised.
Typical service conditions for these metering projects are an ambient temperature of -40°C to +85°C, relative humidity of 5% to 85%RH non-condensing, altitude up to 2000 m, and surroundings free of corrosive gas or explosive dust, with resistive load switching.
Customization
Custom assemblies are available with flexible wire and/or copper straps, and/or an integrated shunt, so the relay can be delivered as a sub-assembly matched to the meter manufacturer's internal layout. Coil voltage, single or double coil drive, and the addition of an auxiliary contact are all specified at order stage. Because latching relays are a core product line of Zhejiang Great Electrical, custom configurations are reviewed by an in-house engineering team of 60 engineers.
FAQ
Does the GRT508M need continuous coil power to stay closed?
No. Only impulse excitation is required, and the relay holds its position after the pulse. Both single-coil and double-coil versions are available.
What load can the three contacts carry?
The rated resistive load is 80A per the specification, with a maximum switching current of 80A and a maximum switching voltage of 380VAC.
Which coil voltages can be ordered?
The coil voltage range is 5–24 VDC. The exact nominal value is selected at order stage.
What happens under short-circuit conditions?
The relay is rated for a maximum short-circuit current of 2500A/10ms and 4500A/10ms with no explosion.
How long does the relay last?
Mechanical endurance is 100,000 operations. Electrical endurance is 10,000 operations at 60A 250VAC and 6,000 operations at 80A 250VAC.
Is an auxiliary contact available?
Yes. An auxiliary contact can be added to the three main contact sets.
Can the relay be supplied as a wired assembly?
Yes. Custom assemblies can be built with flexible wire and/or copper straps, and/or an integrated shunt.
Which standards does the relay comply with?
The GRT508M is RoHS compliant and IEC62055-31 UC2 compliant, with 4KV dielectric strength between coil and contacts.
Inquiry Information
Zhejiang Great Electrical Co., Ltd. — established 2003, 50,000 m² factory, 500 employees, 60 engineers, products exported to EU and India.
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