ABB 1SDA038340R1 Signal low-voltage release device

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1. Product Overview

The ABB 1SDA038340R1 Signal Low-Voltage Release Device (LVR) is an auxiliary protection module for circuit breakers. It operates in the auxiliary circuit of a breaker and triggers the breaker to trip when the main circuit loses voltage or experiences low voltage, providing remote signal indication and safety protection.
It enhances the safety and reliability of low-voltage control systems and is widely used in industrial automation and low-voltage power distribution systems.

2. Main Technical Specifications (Typical)

• Model: 1SDA038340R1

• Product Type: Signal Low-Voltage Release Device (LVR)

• Applicable To: ABB Low-Voltage Circuit Breakers

• Control Voltage Range: AC/DC 24–240 V (may vary slightly by version)

• Contact Type: Auxiliary contact, typically 1 NO + 1 NC

• Function:

  • Trips breaker upon low-voltage or power loss

  • Provides remote signal output

• Response Time: < 50 ms (typical, varies with voltage and load)

• Mounting Method: Direct installation on breaker auxiliary terminals

• Operating Temperature: -25 ℃ to +70 ℃

• Insulation Class: Complies with IEC 60947-2

• Rated Current/Voltage: Matches connected breaker rating

• Operating Environment: Industrial low-voltage distribution

• System Compatibility: Compatible with ABB Emax and Tmax series breakers

3. Key Advantages and Features

1. Reliable Low-Voltage Trip Protection

   • Trips the breaker when control voltage is lost or below threshold

   • Enhances distribution system safety

2. Remote Signal Output

   • Supports alarms or remote monitoring

   • Improves intelligent management of the system

3. Compact Installation Design

   • Mounts directly on breaker auxiliary terminals

   • Saves space inside distribution cabinets

4. High Compatibility

   • Fits ABB Emax and Tmax breakers

   • Easy to upgrade or replace

5. Industrial-Grade Durability

   • Wide operating temperature range

   • Resistant to vibration and harsh industrial environments

4. Typical Applications

• Industrial low-voltage distribution systems

• Electrical control and protection panels

• Industrial automation systems

• Power plants and substations distribution units

• HVAC, pump stations, and production line equipment protection

5. Installation and Maintenance Notes

1. Verify Control Voltage Compatibility

   • Ensure control voltage matches the LVR device before installation

2. Power-Off Installation

   • Disconnect breaker control power before installing, testing, or replacing

3. Proper Wiring

   • Secure wiring of auxiliary contacts

   • Avoid routing signal wires alongside high-voltage cables

4. Environmental Requirements

   • Avoid high temperature, humidity, and corrosive conditions

   • Ensure proper ventilation inside distribution cabinets

5. Periodic Inspection

   • Regularly check contact status and trip reliability

   • Ensure proper operation of the LVR