1SDA073696R1 ABB YU E1.2..E6.2-XT7-XT7M 48 VAC/DC Undervoltage Release

Why Choose the ABB YU E1.2..E6.2 48 VAC/DC Undervoltage Release?

The ABB YU E1.2..E6.2 48 VAC/DC, order code 1SDA073696R1, is a 48 V AC/DC undervoltage release designed for compatible ABB SACE Emax 2 circuit breakers. The YU accessory provides fail-safe circuit-breaker control by acting on the operating mechanism when its continuously supplied control voltage is lost or falls sufficiently below the required operating level.

The accessory is suitable for ABB SACE Emax 2 E1.2, E2.2, E4.2 and E6.2 circuit breakers and is also specified for compatible ABB Tmax XT7 and XT7M devices. Its 48 V AC/DC rating provides flexibility for installations using either AC or DC control circuits, with the AC rating applicable at both 50 Hz and 60 Hz.

Unlike a shunt opening release, which trips the breaker when an external voltage command is applied, the YU undervoltage release is intended for applications where breaker operation depends on the presence of its control supply. This makes the ABB 1SDA073696R1 particularly suitable for fail-safe control systems, emergency shutdown arrangements and installations where loss of control voltage must initiate circuit-breaker opening.

Key Advantages

• Genuine ABB YU undervoltage release for compatible circuit breakers.
• Rated for a 48 V AC/DC control supply.
• Supports 48 V AC at 50 Hz and 60 Hz.
• Supports 48 V DC control circuits.
• Compatible with SACE Emax 2 E1.2 through E6.2 frame sizes.
• Also suitable for compatible ABB Tmax XT7 and XT7M circuit breakers.
• Provides fail-safe undervoltage operation when the control supply is interrupted.
• Original ABB accessory designed for integration with specified ABB circuit-breaker platforms.

Key Features

• ABB SACE Emax 2 electrical accessory.
• Accessory type: Undervoltage release / undervoltage coil.
• ABB designation: YU.
• Rated voltage (Ur): 48 V.
• Rated control supply voltage: 48 V AC/DC.
• AC control frequency: 50/60 Hz.
• Actuation voltage type: AC/DC.
• Delayed operation: No.
• Suitable for power circuit breakers: Yes.
• Compatible with Emax 2 E1.2, E2.2, E4.2 and E6.2 frames.
• Compatible with specified Tmax XT7 and XT7M circuit breakers.
• ABB US/Canada part number: ZEAUC.

Fail-Safe Undervoltage Control for ABB Circuit Breakers

The ABB YU undervoltage release is designed to provide circuit-breaker control based on the availability of its control supply. The coil is continuously energised during normal operation, and interruption or sufficient reduction of this supply causes the release to act on the circuit-breaker mechanism. This principle makes the YU particularly useful where loss of control power must result in a safe circuit condition.

The 48 V AC/DC design provides flexibility for both alternating-current and direct-current control systems. Compatibility across Emax 2 frame sizes from E1.2 through E6.2 also allows a common undervoltage-release concept to be used across switchboards incorporating different ABB air circuit breaker frame sizes.

Typical Applications

• Undervoltage control of ABB SACE Emax 2 air circuit breakers.
• Fail-safe circuit-breaker opening systems.
• Emergency shutdown and safety control circuits.
• Industrial low-voltage switchboards.
• Automated power distribution systems.
• Generator and transformer distribution switchgear.
• Control systems requiring breaker response to loss of control voltage.
• Industrial, commercial and infrastructure power distribution.