Siemens 3VA99080BB25 Circuit Breaker Accessory

Product Overview

The Siemens 3VA99080BB25 is a SENTRON 3VA series undervoltage release (UVR) accessory designed for Siemens 3VA1 and 3VA20-26 molded case circuit breakers (MCCB). It is installed inside the circuit breaker to provide automatic tripping when the control voltage drops below a specified level, improving system safety and protection.

It is commonly used in industrial power distribution systems, motor control applications, and electrical safety circuits where undervoltage protection is required.

Main Specifications

• Manufacturer: Siemens
• Model: 3VA99080BB25
• Alternative Model: 3VA9908-0BB25
• Series: SENTRON 3VA Accessories
• Product Type:
  • Undervoltage Release
  • Circuit Breaker Trip Accessory
  • MCCB Internal Accessory
• Compatible Breakers:
  • Siemens 3VA1
  • Siemens 3VA20–3VA26 molded case circuit breakers

Technical Specifications

Electrical Data

• Release Type: Undervoltage release (UVR)
• Rated Control Voltage: 208–230 V AC
• Frequency: 50/60 Hz
• Function:
  • Trips breaker when voltage falls below the operating threshold
  • Prevents breaker closing during insufficient voltage conditions

Mechanical Data

• Installation Position: Internal mounting inside MCCB
• Application: Circuit breaker accessory module
• Product Weight: Approx. 0.08 kg

Functions

Undervoltage Protection

When the control voltage decreases or fails:

• The undervoltage release activates
• The circuit breaker trips automatically
• Protects connected equipment from abnormal voltage conditions

Features & Advantages

• Original Siemens SENTRON accessory
• Improves circuit breaker safety performance
• Provides reliable undervoltage monitoring
• Prevents unintended equipment operation after power recovery
• Compact internal installation design
• Easy integration with Siemens 3VA MCCB systems
• Suitable for industrial electrical protection applications

Applications

Used in:

• Industrial power distribution panels
• Motor control centers (MCC)
• Factory automation systems
• Machine control cabinets
• Building electrical systems
• Energy management systems

Typical applications:

• Motor protection circuits
• Emergency shutdown systems
• Safety interlocking circuits
• Low-voltage distribution equipment