Internal accessories, Auxiliary Switches and Alarm Switches – 3VM9988-0AA12

Product Description

Siemens SENTRON Internal Accessories – Auxiliary Switch & Alarm Switch – 3VM9988-0AA12

The Siemens 3VM9988-0AA12 is an internal accessory for SENTRON 3VM MCCB systems, used as an auxiliary switch and alarm switch module. It is designed to provide electrical status indication and fault signaling of the circuit breaker, enabling integration with PLC systems, SCADA, control panels, and remote monitoring circuits.

This accessory is essential in modern electrical distribution systems where breaker ON/OFF position feedback and trip indication signals are required for safety and automation.

Key Features:

•Siemens SENTRON 3VM series internal accessory 

• Part Number: 3VM9988-0AA12 

• Auxiliary + alarm switch combination module 

• Contact configuration: 2NC + 4NO changeover contacts 

• Mounting type: Side-mounted accessory (plug-in design) 

• Rated operational current: up to 6A 

• Suitable for SENTRON 3VA / 3VM MCCB systems up to 630A 

• Provides breaker position indication (ON/OFF/TRIP status feedback) 

• Supports fault signaling (overload or short-circuit trip indication) 

• High reliability for industrial control circuits 

• Compact modular design for easy installation 

• Screw terminal connection 

• Surge voltage resistance: up to 4 kV