Customer Interface Relay

CIR-3PS+

The SSI CIR-3PS+ Customer Interface Relay is the most feature-complete relay in the CIR+ series, providing two isolated solid-state KYZ contacts plus a dedicated End-of-Interval (EOI) dry Form A output from a single Form A or C input. It is designed as the utility’s interface between the kWh meter, recorder, and a customer-owned energy control system — packaged in a single compact, ready-to-use NEMA 4X weather-resistant enclosure.

The CIR-3PS+ features the same dual-compartment design as the CIR-1PS+ and CIR-2PS+: a locked upper utility compartment housing all electronics and coordinated fusing, and a lower customer compartment with terminal strip, fusing, LED status indicators, and two user-accessible switches for output mode and EOI timing duration. This clear separation of utility and customer access supports fast, straightforward field troubleshooting.

The CIR-3PS+ Customer Interface Relay on a white background.

Product Highlights

The EOI output is a separate dry Form A contact that signals the end of a metering interval, with a customer-selectable fixed duration of 100, 300, 500, or 1000 milliseconds, or a “long” mode that follows the actual EOI signal duration. A dedicated yellow LED in the customer compartment displays EOI status independently of the energy pulse LEDs, giving technicians clear visual confirmation of all three outputs simultaneously.

All three outputs use solid-state switching devices rated at 800V and 750mA, and built-in transient suppression eliminates the need for external suppressors. Coordinated double “K” lead fusing across both compartments protects against overcurrent and wiring faults, and input/output isolation is rated at 2500Vrms.

Features

The SSI CIR-3PS+ provides two isolated KYZ outputs plus a configurable End-of-Interval output from a single meter input in a weatherproof NEMA 4X enclosure.
  • Three isolated outputs — one field-selectable Form A or Form C customer output, one fixed utility Form C output, and one Form A EOI contact.
  • End-of-Interval (EOI) output — dedicated dry Form A contact with selectable fixed duration (100, 300, 500, or 1000mS) or actual EOI signal duration.
  • Dual-compartment NEMA 4X enclosure — locked utility compartment and separate customer compartment in a single weatherproof ready-to-use package.
  • Two customer-accessible switches — independently select output mode (2-wire or 3-wire) and EOI timing duration without utility access.
  • Coordinated dual-compartment fusing — double "K" lead fusing across utility and customer compartments for fast fault isolation.
  • 800V/750mA solid-state switching — provides maximum protection from lightning and transient voltage damage across all outputs.
  • Three-LED status display — red, green, and yellow LEDs in the customer compartment independently indicate energy pulse and EOI output status.
The CIR-3PS+ Customer Interface Relay

Dual KYZ plus EOI interface

world leader

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