Detaching And Installing The Plug-In Unit - ABB REF 610 Operator's Manual

Feeder protection relay

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1MRS755539

4.4.2.

Feeder Protection Relay

Operator's Manual - ANSI Version

Fig. 4.4.1.-1

Checking the order number of the relay

α = 25º

y = 40 mm

Detaching and installing the plug-in unit

Before detaching the plug-in unit from the case, the auxiliary voltage

must be disconnected.

To detach the plug-in unit:

1. Lift the lower handle until the spring-loaded locks on both sides of the handle are

released and the unit is pushed about 6 mm out of the case. This separates the

connectors.

2. Pull the unit out of the case.

The relay features an automatic short-circuit mechanism in the current transformer

(CT) connector. Therefore, detaching the plug-in unit will not open the secondary

circuit of the CT which otherwise could cause dangerously high voltages.

Signal connectors are left open when the plug-in unit is detached.

REF 610

A040165

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