1SDA051357R1 ABB UVD T1–T6 24–30 V AC/DC Electronic Time Delay

Why Choose the ABB 1SDA051357R1 UVD Electronic Time Delay?

The ABB 1SDA051357R1, product designation UVD T1...T6 24...30Va.c./d.c., is an electronic time-delay device for an undervoltage release (UVR) used with ABB Tmax moulded-case circuit breakers. Rated for 24–30 V AC/DC, it is designed to delay operation of the associated undervoltage release where immediate tripping following a short-duration voltage reduction or interruption is not required.

ABB specifies this UVD accessory for Tmax T1 through T6 applications and also identifies compatibility with SACE Tmax XT1 through XT4. The device works in conjunction with the appropriate undervoltage release rather than replacing it, providing an electronic delay between the supply-voltage disturbance and operation of the UVR.

With a configurable delay range of approximately 0.25–3 s, the 1SDA051357R1 can help prevent unnecessary breaker opening during brief voltage dips while preserving the protective function of the undervoltage release when the low-voltage condition persists. Its dual AC/DC control-voltage capability makes it suitable for a variety of industrial and commercial control-power arrangements.

Key Advantages

• Provides an electronic time delay for ABB undervoltage releases.
• Rated for 24–30 V AC and 24–30 V DC control supplies.
• Compatible with ABB Tmax T1–T6 applications.
• Also specified by ABB for SACE Tmax XT1–XT4.
• Helps avoid unnecessary breaker operation during short-duration voltage dips.
• 0.25–3 s time-delay range supports application-specific coordination.
• Suitable for industrial, commercial and infrastructure switchboards.
• Genuine ABB accessory identified by order code 1SDA051357R1.

Key Features

• UVD electronic time-delay device.
• Designed for use with an appropriate undervoltage release (UVR).
• 24–30 V AC rated control voltage.
• 24–30 V DC rated control voltage.
• Time-delay range of approximately 0.25–3 s.
• Compatible with Tmax T1 through T6.
• Compatible with SACE Tmax XT1, XT2, XT3 and XT4.
• Electronic operation for controlled UVR delay.
• Suitable for AC or DC control-power systems.
• ABB accessory classification: delay device for UVR.
• Designed in accordance with applicable ABB circuit-breaker accessory requirements.

Controlled Undervoltage Release Operation

An undervoltage release is used to open a circuit breaker when its control voltage falls below the operating conditions required by the release. In installations where very short voltage disturbances should not result in immediate breaker opening, an electronic time-delay device can be added between the control supply and the associated UVR. The ABB 1SDA051357R1 provides this function for compatible Tmax circuit breakers using a 24–30 V AC/DC supply.

By introducing an adjustable delay of approximately 0.25–3 s, the UVD can allow brief voltage dips to pass without unnecessarily operating the undervoltage release. If the undervoltage condition continues beyond the configured delay, the associated UVR can perform its intended breaker-opening function. The UVD should therefore be selected and used together with the correct ABB undervoltage release for the circuit breaker and control-voltage arrangement.

Typical Applications

• ABB Tmax T1–T6 moulded-case circuit-breaker installations.
• ABB SACE Tmax XT1–XT4 circuit-breaker installations.
• Industrial low-voltage switchboards.
• Motor-control and process-distribution systems.
• Commercial building electrical distribution.
• Control systems subject to brief voltage dips or interruptions.
• Generator and auxiliary power-distribution systems.
• Applications requiring delayed operation of an undervoltage release.