Internal accessories for SENTRON, Undervoltage releases - 3VM9908-0BB26

Product Description

Siemens Internal Accessories – Undervoltage Release – 3VM9908-0BB26

The Siemens 3VM9908-0BB26 is an undervoltage release (UVR) internal accessory designed for SENTRON 3VM series MCCB systems. It ensures that the breaker automatically trips when the control voltage drops below a defined safe threshold, helping protect equipment from undervoltage operation, unstable supply conditions, and motor damage.

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

Key Features:

• Siemens SENTRON 3VM series internal accessory
• Part Number: 3VM9908-0BB26
• Undervoltage release (UVR) function for MCCB protection
• Rated control voltage: 380–400V AC, 50/60 Hz
• Automatically trips MCCB when voltage falls below safe operating level
• Protects motors and sensitive equipment from undervoltage conditions
• Prevents unexpected restart after power restoration
• Compact plug-in internal accessory design
• Low power consumption: approx. 2.5 VA
• High insulation strength and surge voltage resistance
• Suitable for Siemens 3VM MCCB systems (up to 630A frame range)
• Easy installation inside breaker accessory slot
• Complies with Siemens SENTRON internal accessory standards