2 - 2CDC106069D0201

Functional description

1

2

3

4

5

6

7

8

9

Adjustable current setting for overload protection

Status indication

Automatic or manual reset selectable

Application / internal function

The thermal overload relays are three pole relays with bimetal tripping elements (1 per pole). The motor current flows through

the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal

elements become bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching

position (95-96 / 97-98). The contact 95-96 is used to control the load contactor.

The overload relays have a setting scale in Amperes, which allows the direct adjusting of the relay without any additional

calculation. In compliance with international and national standards, the setting current is the rated current of the motor

and not the tripping current (no tripping at 1.05 x I, tripping at 1.2 x I; I = setting current). The relays are constructed in way

that they protect themselves in the event of an overload. The overload relay has to be protected against short-circuit. The

appropriate short-circuit protective devices are shown in the table.

Operation mode

3~

1~

Contact 95-96

Contact 97-98

Status indication

Comment

Trip state

open

closed

RESET state

closed

open

ON

TEST manual reset mode

open

closed

TEST auto reset mode

open

closed

while TEST is operated

STOP while device is in trip state

open

closed

STOP button has no function

STOP while device is in RESET state

open

open

while STOP button is pressed

Wiring diagram

97

95

98

96

2T1

4T2 6T3

RESET

A

M

TEST

STOP