Internal accessories for SENTRON, Undervoltage releases - 3VM9908-0BB25

Product Description

Siemens Internal Accessories – Undervoltage Release – 3VM9908-0BB25

The Siemens 3VM9908-0BB25 is an undervoltage release (UVR) internal accessory designed for use with SENTRON 3VM series MCCBs. It ensures automatic tripping of the circuit breaker when the supply voltage drops below a defined safe level, protecting equipment from undervoltage operation, phase instability, and motor damage.

This accessory is widely used in LT panels, MCC/PCC systems, and industrial distribution boards, where fail-safe disconnection and controlled restart prevention are required.

Key Features:

• Siemens SENTRON 3VM series internal accessory
• Part Number: 3VM9908-0BB25
• Undervoltage release (UVR) function for MCCB protection
• Rated control voltage: 208–230V AC, 50/60 Hz
• Automatically trips MCCB when voltage drops below safe operating level
• Prevents motor operation under undervoltage conditions
• Helps avoid equipment overheating and unstable torque conditions
• Compact plug-in internal accessory design
• Low power consumption (~2 VA)
• High insulation strength and reliable operation
• Suitable for Siemens 3VM MCCB up to 630A frame range
• Easy integration inside breaker accessory slot
• Complies with Siemens SENTRON accessory standards