CIR-2A
Customer Interface Relay

GENERAL DESCRIPTION

The CIR-2A customer interface relay is designed to provide two isolated "dry", mercury-wetted sets of contacts from a single Form "C" input. One set of contacts may be configured to either a Form "A" (K & Y) contact or a Form "C" (K, Y, & Z) contact. The second set of contacts is a 3-wire output typically used for a pulse recorder. The typical application is the utility's interface between the KWH meter & recorder, and a customer's energy control system. The CIR-2A provides in one compact ready-to-mount case everything necessary to provide a customer with energy control pulses in one box.

The CIR-2A is internally divided into two compartments. The upper compartment is normally locked with a utility company's lock and is only accessible to utility metering personnel. It contains all of the electronics along with fusing which is coordinated with the fuse contained with in the customer's compartment. The customer's compartment, contains a terminal strip, fusing, status indication LEDs, and a switch which allows the customer to choose either a 2-wire or 3-wire output. With the switch in the two-wire mode of operation a relay contact closure of approximately 100 milliseconds will occur for each change of the 3-wire input status at the K & Y terminals on the terminal strip. The red LED will only light each time there is a contact closure. With the switch in the 3-wire mode, the terminal strip contacts K & Y, and K& Z, will follow the input 3-wire status. In the 3-wire mode both the red and green LEDs are lighted sequentially depending upon input status.

The use of the LED in the customer's compartment allows a rapid visual check of the system's performance by inexperienced personnel without requiring any additional test equipment. Because of the redundant coordinated fusing in both the utilities and customer's compartments, the meter shop service coordinator can usually determine the location of the service problem as to either utility responsibility or customer responsibility by the simple question "are the LEDs flashing"? The double "K" lead coordinated fusing of the CIR-2A's output will prevent damage to the relay under almost any conditions a user might cause such as excessive current, incorrect wiring, etc. The CIR-2A has built-in transient protection for the mercury-wetted relay's contacts which eliminates the need for external or off-the-board transient suppressors.

CIR-2A SPECIFICATIONS

ELECTRICAL

Power Input	90 to 325 VAC. Burden: 10 MA. at 120 VAC
Output	One set of "dry" Form "A" or Form "C" contacts (K & Y or K, Y, & Z) for selected by a user changeable switch located in the customer's compartment and one fixed set of Form "C" contacts located in the utility's compartment, both for energy pulses. The contacts are mercury- wetted "no bounce" relays rated at 500 VDC or 350 VAC 2 Amps. break, 5 amps carry. The maximum rating of the contacts is 100 VA. Factory fused at 1/2 amp. (3AG)
Sense Voltage	+13 VDC
Contact Resistance	50 milliohms maximum, 12 to 14 typical
Insulation Resistance	50 megohms typical
Operate and Release Time	2.5 milliseconds typical operate; 3.0 milliseconds typical release

MECHANICAL

Mounting	Within 30 degrees of vertical
Size	9.00 inches wide, 11.00 inches high, 4.50 inches deep
Type/Material	NEMA 4X Fiberglass Enclosure
Weight	9.5 pounds

TEMPERATURE

Temperature Range	-38° C to +70° C, -36.4° F to +158° F
Humidity	0 to 98% non-condensing

OPTIONS

Input Voltages

125 VDC input using the DCS-1 Power Supply. Contact factory for other input voltages.