3WA9111-0AG01

What does this accessory do?

This accessory is an auxiliary switch block for the Siemens SENTRON 3WA circuit breaker range. It is designed to add extra auxiliary contacts so the breaker can be integrated more easily into indication, signalling and control circuits.

Which breaker range is it intended for?

It is intended for use with Siemens 3WA circuit breakers. If you are matching accessories to a 3WA installation, 3WA9111-0AG01 is designed specifically for that family rather than as a general-purpose switch block.

What contact arrangement does it provide?

This unit provides 2 normally open contacts and 2 normally closed contacts, often written as 2NO+2NC. That combination gives flexibility when separate indication or control signals are needed from the same breaker assembly.

Can it be used for signalling and control functions?

Yes. An auxiliary switch block like this is commonly used where a breaker needs to interface with panel indication, monitoring circuits, interlocking schemes or other control wiring. The 2NO+2NC arrangement makes it suitable for a range of auxiliary switching duties.

Is this a standalone switching device?

No. It is an accessory intended to work with a compatible Siemens 3WA circuit breaker. It is not typically selected as a standalone panel switch, but as an add-on component within a breaker assembly.

What is the pollution degree of this accessory?

The stated pollution degree is 3. In practical terms, that rating helps define the environmental conditions the accessory is intended for within electrical equipment and industrial panel applications.

What short-circuit protection values are stated for the auxiliary circuit?

The published data states a maximum permissible 8 A DIAZED gG fuse link for short-circuit protection, or alternatively a miniature circuit breaker up to 8 A with class C tripping characteristic. Those values are useful when reviewing auxiliary circuit protection arrangements.

Where is this type of accessory commonly used?

It is typically used in switchboards, industrial distribution assemblies and other installations where a 3WA air circuit breaker needs additional auxiliary contacts for status-related electrical functions within the wider panel design.

Why would someone choose a 2NO+2NC auxiliary switch block?

A 2NO+2NC layout offers a balanced mix of contact types, which can be useful when one application needs separate make and break signals. That helps designers allocate contacts across indication, control logic and interface wiring without immediately needing extra contact modules.

Is this accessory suitable for new panel builds as well as replacement requirements?

Yes. This type of breaker accessory is commonly specified both for new assemblies and when replacing an existing auxiliary switch block in a compatible Siemens 3WA setup, provided the overall configuration matches the application.