Locking Provision To Prevent Unauthorized Closing - Safe Open; Description - Siemens SENTRON 3WA1 Manual

4.8.2

Locking provision to prevent unauthorized closing - Safe Open

4.8.2.1

Description

In the case of locking provisions to prevent unauthorized closing - Safe Open, either
padlocks or safety locks securely lock the circuit breaker in the open state (e.g. during
service calls and inspections). Closing is not possible either locally or remotely.
The conditions for switch disconnectors in the OPEN position are fulfilled according to
IEC60947-2 and this locking provision fulfills the main switch conditions for a supply
disconnecting (isolating) device according to EN 60204-1 in the OPEN position.
Loss of locking function when the circuit breaker is replaced
This lock only affects the locked circuit breaker. If the circuit breaker is replaced,
closing is no longer prevented unless the new circuit breaker is also protected against
unauthorized closing.
Only replace locked circuit breakers with circuit breakers that are also locked.
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
WARNING
4.8 Accessories for protection against unauthorized operation
Accessories
307