Metering-Unit No. 4A

This metering unit is for use at PABX's No. 1 and No. 7 where switched trip metering is required.  It is intended to rest on a desk or table adjacent to the switchboard.

The front panel is provided with two Keys No. 2101-2C, two trip meters (Meters No. 21B), clearing lamp and two Switches, Rotary CD5139.

Provision is made for a third meter, which is covered by a plank plate.

This unit is wired to the Supervisory Relay Circuit SA8136.

Drawings - 92989 and 93008.

Diagram - SA8279 and SAW82790.

Specification - S1071.