ABB YU-1SDA073700R1 Undervoltage Release

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1. Product Overview

The ABB YU-1SDA073700R1 is an undervoltage release accessory for low-voltage circuit breakers. It is intended for use with the SACE Emax 2 and Tmax XT ranges (models E1.2…E6.2 and XT7/XT7M). When the control voltage falls below a predetermined level or fails completely, this release causes the associated circuit breaker to trip, thereby providing enhanced operational safety.

2. Technical Specifications

• Model: YU E1.2..E6.2-XT7-XT7M 220-240 VAC/DC (Product code: 1SDA073700R1)

• Rated control voltage: 220-240 V AC/DC

• Suitable for: Circuit breaker series XT7 / XT7M and E1.2 / E2.2 / E4.2 / E6.2 (SACE Tmax XT / SACE Emax 2)

• Dimensions: Width ~105 mm, Height ~55 mm, Depth/Length ~135 mm

• Net Weight: ~0.12 kg

• Standards: IEC (for low voltage circuit breaker accessories)

• Environmental compliance: RoHS directive 2011/65/EU & Amendment 2015/863

3. Product Advantages & Features

Advantages:

• Provides prompt tripping of the circuit breaker when the control voltage drops or fails, increasing system safety.

• Modular accessory form allows easy integration into the main breaker assembly, improving system reliability.

• Compatibility with multiple breaker series simplifies spare parts management and system standardization.

Features:

• Supports both 220-240 V AC and DC control voltages, allowing flexibility in control supply systems.

• Compact size and lightweight (~0.12 kg) enable space-efficient installation.

• Clearly marked compatibility (XT7/XT7M and E1.2…E6.2) for easy configuration.

• Designed in accordance with industrial safety standards, suitable for low voltage distribution systems.

4. Application Fields

• Low voltage switchgear and distribution panels, as an auxiliary safety release for circuit breakers.

• Industrial plants, production lines, building installations, and machinery where control-supply faults must trigger reliable shutdown.

• Power substations, switchboards, UPS systems, emergency power supplies where voltage sag protection is required.

• Data centres, telecom sites, transportation signal systems, public utilities—applications demanding high-reliability power interruption protection.

5. Precautions

1. Before installation, verify compatibility between the undervoltage release and the target circuit breaker model (XT7/XT7M, E1.2…E6.2).

2. Ensure control supply voltage is exactly 220-240 V AC or DC as specified; voltage mismatch may cause mis-operation or failure.

3. Install the accessory away from physical vibration, high temperature, corrosive atmospheres or strong electromagnetic interference.

4. Ensure wiring between the breaker and the accessory is secure; poor connections may compromise protection.

5. When performing maintenance or replacing components, always isolate control power to prevent unintended tripping or electrical hazards.

6. After installation or replacement, perform a drop-voltage test to verify that the breaker reliably trips when control voltage falls.

7. Retain manufacturer documentation and technical data sheets for future system maintenance, troubleshooting or parts replacement.

The structure and details of the product：

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