LCR-3B Auxiliary Load Control Relay

LCR-3B Auxiliary Load Control Relay

The LCR-3B auxiliary load control relay is designed to interface with loads or control circuits and features a dry-contact switch input. It is commonly used to interface between electric meters and loads or control circuits whose ratings exceed the meter manufacturers’ 100mA/120VAC specification of the KYZ switching device. It is a convenient and low-cost way to interface a higher current load to a low current output, improving isolation and enhancing electric meter reliability.

The LCR-3B is designed to safely interface with utility load management receivers, customer-owned equipment or control circuits involved in load management programs. A 2-wire, dry-contact output from the meter is used to activate the higher current output as shown in Figure 1 below. It provides a very low-current sense wetting voltage and may be used with meters having dry-contact outputs whether electro-mechanical, or high or low voltage semiconductor outputs.

When the control signal is sensed, the LCR-3B’s solid-state relay is energized, closing the normally-open contact. The LCR-3B’s output is configured as a 2-Wire Form A output (Normally Open) capable of switching up to 1 Amp, across a wide AC voltage range of 12 to 120VAC.

The LCR-3B is potted in epoxy in a 2” x 1.5” x 1” enclosure with 18” leads for the input and output terminals. Two mounting tabs are provided but no mounting is required. The LCR-3B may be positioned inside a meter enclosure or other convenient location due to its small size. No conductive parts are exposed allowing excellent isolation between any potentials or ground. Built-in transient protection for the relay’s contacts is included, eliminating the need for external or off-the-board transient suppressors.

LCR-3B Auxiliary Load Control Relay Diagram

Specifications

Electrical
Power Input:90 to 135 VAC or 180 to 300 VAC. Burden: 10 mA at 120 VAC
Output:One dry Form C contact (COM, NO, & NC). The contacts are rated at 28 VDC or 250 VAC @ 3 Amps. Factory fused at 2 amps. (3AG)
Contact Resistance:50 milliohms maximum
Insulation Resistance:100 megohms minimum
Operate and Release Time:5 milliseconds typical

Mechanical
Mounting: Any position
Size:2” length, 1.5” width, 1” height
Weight:10 ounces

Temperature
Temperature Range:

-38º C to +70º C, -38.4º F to +158º F

Humidity: 0 to 98% non-condensing

All specifications are subject to change without notice.