Siemens 8DJH User Manual

500-8067.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • Revision 05 79/121
Installation
15.2 Mechanical and electrical function test
Undervoltage release
(optional)
The operating mechanism of the circuit-breaker type 2 can optionally be equipped with an
undervoltage release. The undervoltage release is located in the operating mechanism
compartment behind the front cover.
A retaining bolt is screwed into the undervoltage release. The function of the undervoltage
release can be blocked by changing the position of the retaining bolt.
• On circuit-breakers type 2, the undervoltage release is delivered by the factory in position A
"Trip blocked".
Changing the setting of the undervoltage release:
➭ Remove the front plate.
➭ Insert the retaining bolt of the striker at the undervoltage release in the desired position.
✔ Mount the front plate.
DANGER
Putting defective switchgear into operation can endanger the life of people and damage the
switchgear.
➭ Never put switchgear into operation if during test operation a part of it does not work as
described here. Please contact the regional Siemens representative.
➭ Perform test operations without high voltage!
ATTENTION
The circuit-breaker can be damaged by no-load switching. After charging the spring energy
store, do not open the circuit-breaker directly.
➭ After charging the spring energy store, close the circuit-breaker first, and then open it.
Fig. 54: Undervoltage release
①
Retaining bolt of the striker
Position A: Trip blocked
Position B: Trip free
DANGER
Risk of injury by release of charged operating springs when the front cover of the operating
mechanism is removed! Bruises or cuts at the hands can be the consequence.
➭ To avoid impermissible switching operations, switch off auxiliary voltage, e.g.:
- Switch the auxiliary voltage supply of the motor.
-Trip the MCB.
- Disconnect the control cables from the low-voltage compartment.
➭ To discharge the spring energy store in the operating mechanism, perform the following
operations before removing the front cover:
- Actuate the OFF pushbutton.
- Actuate the ON pushbutton.
- Actuate the OFF pushbutton.
➭ The spring energy store indicator must show "spring not charged".

Siemens 8DJH Specifications

General

Brand	Siemens
Model	8DJH
Category	Switch
Language	English