CT Assembled 120A Latching Relay for Three-Phase Energy Meters
CT Assembled 120A Latching Relay for Three-Phase Energy Meter Applications
As energy metering systems continue to evolve, relay components need to provide reliable switching performance while maintaining compact dimensions and efficient power consumption. For three-phase energy meter applications, a relay must handle relatively high current while maintaining stable electrical performance over repeated switching cycles.
The IM1201T-120A CT assembled latching relay from IVY Metering is designed for this type of application. With a maximum switching current of 120A, the relay integrates a CT assembly and is specifically listed for use with State Grid three-phase meters.
120A Switching Capacity for Energy Meter Systems
One of the key characteristics of the IM1201T-120A is its high-current switching capability. The relay supports a maximum switching current of 120A, a maximum switching voltage of 250VAC, and a maximum switching power of 30,000VA.
This capacity allows the relay to be integrated into energy metering systems where reliable switching of higher-current loads is required.
The relay uses AgSnO₂ contact material and provides a contact resistance of less than 2.0mΩ, helping maintain efficient electrical conduction during operation.
CT Assembled Design for Three-Phase Meters
The IM1201T-120A is not simply a conventional high-current relay. Its specification identifies it as a CT assembled latching relay, with application to three-phase energy meters.
The integrated design can help meter manufacturers incorporate relay and current-transformer-related components into their meter architecture while maintaining a compact component footprint.
With dimensions of approximately 78.6 × 40.3 × 37.8 mm and a weight of about 305 g, the relay is designed for integration into electrical metering equipment.
Low Power Consumption with Magnetic Latching Operation
The relay adopts a magnetic latching design. It is available with either a single-coil or dual-coil configuration, with rated power consumption of 3.0W and 6W respectively. The specified pulse duration is at least 100ms.
A latching relay maintains its contact state after the driving pulse, rather than requiring continuous coil energization to maintain the switched position. This makes magnetic latching technology particularly useful in applications where reducing continuous relay coil power consumption is important.
Long Electrical and Mechanical Life
Reliability is another important consideration for energy meter relays. The IM1201T-120A provides an electrical life of more than 10,000 cycles and a mechanical life of more than 100,000 cycles.
The relay also has a pickup and release time of no more than 30ms, supporting responsive switching operation in energy metering systems.
Designed for Demanding Operating Conditions
The IM1201T-120A is specified for an ambient temperature range of -40°C to +70°C. It also provides 1000MΩ insulation resistance at DC 500V, more than 2000VAC dielectric strength across open contacts, and more than 4000VAC coil-to-contact dielectric strength.
For mechanical durability, the relay is specified with 10G functional shock resistance and 100G destructive shock resistance.
These specifications make the relay suitable for integration into electrical metering equipment where stable operation and mechanical robustness are important.
Flexible Contact and Coil Configurations
The IM1201T-120A provides 3A/3B contact arrangements, while the nominal coil voltage range is 5–48VDC.
This configuration gives meter manufacturers flexibility when designing relay control circuits for different three-phase energy meter platforms.
For customized requirements, IVY Metering provides engineering support for relay solutions. The product documentation specifically recommends contacting the manufacturer for customized designs and special operating requirements.
Reliable Relay Solution for Energy Meter Manufacturers
For manufacturers developing three-phase energy meters, the relay is an important component in the overall system architecture. The combination of 120A switching capability, CT assembled construction, magnetic latching technology, low contact resistance, and long mechanical life makes the IM1201T-120A suitable for integration into high-current energy metering equipment.
IVY Metering also offers the IM901T 90A magnetic latching relay, which supports a maximum switching current of 90A, 250VAC maximum switching voltage, and 22500VA maximum switching power.
With different current ratings and configurable coil/contact options, IVY Metering can provide relay solutions for different meter designs and application requirements.
Conclusion
The IM1201T-120A CT assembled latching relay combines high-current switching capability with magnetic latching technology and a compact design.
With 120A maximum switching current, 3A/3B contacts, 5–48VDC nominal coil voltage, <2mΩ contact resistance, >10,000 electrical cycles, and >100,000 mechanical cycles, it is designed as a relay solution for three-phase energy meter applications.
For energy meter manufacturers looking for a CT assembled 120A latching relay, IVY Metering provides customized relay solutions and engineering support based on specific meter designs and requirements.
