Customer Interface Relay

CIR-1PS+

The SSI CIR-1PS+ Customer Interface Relay provides a single isolated solid-state dry Form A (KY) or Form C (KYZ) contact from a single Form A or C input. It serves as the utility’s interface between the kWh meter and a customer-owned energy control system, and includes everything required to deliver energy pulses in one compact, ready-to-use NEMA 4X weather-resistant enclosure.

The CIR-1PS+ is divided into two internal compartments — a locked upper utility compartment housing all electronics and coordinated fusing, and a lower customer compartment containing the terminal strip, fusing, LED status indicators, and an output mode switch. This dual-compartment design clearly delineates utility and customer responsibility, enabling fast field troubleshooting by simply asking whether the LEDs are flashing.

The CIR-1PS+ Customer Interface Relay on a white background.

Product Highlights

The customer compartment’s field-selectable switch allows the output to be configured as either 2-wire (Form A) or 3-wire (Form C) without accessing the utility compartment. In 2-wire mode, each relay contact closure is approximately 100mS and occurs on every 3-wire input state change, automatically doubling the pulse value for Form A applications. In 3-wire mode, the KY and KZ contacts directly follow the input’s state.

The CIR-1PS+ is built for durability and safety — the solid-state switching device is rated at 800V and 750mA for maximum protection against lightning and transients, and built-in transient suppression eliminates the need for external suppressors. Coordinated double “K” lead fusing protects against overcurrent and incorrect wiring in both compartments.

Features

The SSI CIR-1PS+ delivers an isolated field-selectable Form A or Form C KYZ output from a single utility meter input, in a compact weatherproof NEMA 4X enclosure.
  • Single isolated KYZ output — one field-selectable Form A (KY) or Form C (KYZ) solid-state dry contact output rated at 250VAC/VDC at 1/2A.
  • Dual-compartment NEMA 4X enclosure — locked utility compartment and separate customer compartment in one weatherproof ready-to-use package.
  • Field-selectable 2-wire or 3-wire output — customer-accessible switch in lower compartment; no utility access required for reconfiguration.
  • Coordinated dual-compartment fusing — double "K" lead fusing in both utility and customer compartments enables fast fault localization.
  • 800V/750mA solid-state switching device — provides maximum protection from lightning and transient voltage damage.
  • Built-in transient suppression — eliminates the need for external or off-board transient suppressors.
  • LED status indicators — red and green LEDs in the customer compartment provide rapid visual system status without test equipment.
The CIR-1PS+ Customer Interface Relay

Single-output utility-to-customer interface

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