ABB EMAX 2 YU-1SDA073698R1 Undervoltage Release, 110-120V AC/DC

Overview

The ABB YU-1SDA073698R1 is an undervoltage release accessory for SACE Emax 2 air circuit breakers and Tmax XT7/XT7M MCCBs. It trips the breaker automatically when supply voltage drops below the threshold, widely stocked as spare for main switchgear and power distribution systems.

Features This YU release is compatible with E1.2, E2.2, E4.2, E6.2 Emax 2 frames. The YU-1SDA073698R1 locks the breaker closing function without sufficient control voltage. It can be installed inside the breaker chamber and replaced individually, with built-in surge suppression for stable operation.

Specs

Model: YU-1SDA073698R1 Series: SACE Emax 2 / Tmax XT accessories Type: undervoltage release Rated voltage: 110–120 VAC/DC Applicable breakers: E1.2, E2.2, E4.2, E6.2, XT7, XT7M Mounting: internal fit inside breaker Protection class: IP20 Certifications: CE, UL Product status: switchgear spare accessory

Principle

The release holds the breaker closing mechanism only when the voltage stays above the minimum threshold. If voltage fails or falls below the set level, the spring mechanism triggers the breaker trip and prevents reclosure until voltage recovers.

Applications

The YU-1SDA073698R1 is widely deployed in power plants, substations, refineries and industrial main switchrooms. It is used for voltage-loss interlock and protection for Emax 2 air circuit breakers.