Summary and Application

The MRL1 of the HIGH TECH LINE is generally used as a common lockout relay, e.g. when the number of the available tripping contacts of the protection relay is to low or when the maximum switching capacity of the relay contacts is exceeded while the tripping coil of the circuit breaker is actuated. 

Characteristics and Features

• high switching capacity of the relay contacts   

• fulfills the requirements, acc. to BS 142 and IEC 255 

• manual, electrical or automatic reset 

• low resistive and high resistive design 

• tripping time ≤ 10 ms

Function

The input signals (trip contacts of the protection relays) are led to terminals A2 - A4 of the MRL1. In case of tripping, the output relay switches the 8 change-over contacts over.

The MRL1 can be operated in two different operational modes.

MRL1 with a high burden (mode HB).

Malfunctions can be caused by induced currents at long-distance lines. The MRL1 is provided with a high burden to prevent such malfunctions. By connecting terminals A7 and A8 the burden can be activated. The power consumption of the inputs is then 150W. This high burden is deactivated by the MRL1 at a tripping event. The residual holding power is 3W* minimum at rated voltage.

MRL1 with a low burden (mode LB).

This operational mode is used where no interference effect on lines is to be expected. Terminals A7 and A8 must not be bridged. The power consumption of the inputs is then 50W. This low burden is deactivated by the MRL1 at a tripping event. The residual holding power  is 3W minimum at rated voltage.

About 40 - 60 ms after pick-up of the relay, the input current is interrupted independently of the burden. This delay makes operation of other relays connected in series possible before the trip cir cuit is disconnected.

Depending on the respective rated voltage   (see Technical Data).

Note: After a trip action, terminals A2/A3/A4 may only have voltage applied for approx. 10 min.

Status indicator

The status indicator shows whether the MRL1 has tripped. Red means tripping. A dark display means not tripped.

The MRL1 must be reset after every tripping action. There are three possible ways of resetting the protection relay.

Resetting

The Reset key permits resetting of the output relay and the indicator if the trip signal at terminals A2/A3/A4 has been switched off.  

The output relay and the indicator can be set back by way of the input terminals A5/E9 by applying the supply voltage, after the trip signal at terminals A2/A3/A4 has been switched off.

Automatic RESET Once the trip signals at terminals A2/A3/A4 have been switched off, the output relays and the indi cators are set back with delay action. The function is activated by the coding plug located behind the front plate (refer to Chapter 3.4).

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