Basler Electric BE 25231-001 – Control Transformer for Auxiliary Power

The Basler Electric BE 25231-001 (also referenced as BE25231001) is a control transformer engineered to supply isolated auxiliary power to generator protection relays, voltage regulators, and other control components. It steps down primary AC voltages to lower secondary levels, providing reliable and noise‑immune power for sensitive electronic circuits.

Electrical Specifications

The transformer features a primary winding suitable for 120/240 V AC input, with a secondary output of 24 V AC or 120 V AC (depending on the tap configuration). It is built with a grain‑oriented silicon steel core and high‑temperature insulation, ensuring low losses and excellent regulation. The unit is encapsulated to protect against moisture and mechanical damage.

• Primary voltage: 120/240 V AC, 50/60 Hz

• Secondary voltage: 24 V AC or 120 V AC (field‑selectable)

• Power rating: 100 VA continuous

• Insulation class: Class B (130 °C)

• Dielectric strength: 2500 V RMS primary‑secondary

• Mounting: panel or DIN‑rail with included bracket

• Terminals: screw‑type, clearly marked

• Dimensions: 85 x 70 x 60 mm

• Operating temperature: –20 °C to +60 °C

Application in Generator Control

This transformer is commonly installed in generator control panels to power relays, contactors, and regulator boards. Its isolated design prevents ground loops and reduces electrical noise, improving the reliability of sensitive measurement circuits. It can also be used to provide a low‑voltage supply for annunciator systems and auxiliary alarms.

Installation and Wiring

Mounting is simple using the provided clips or screws. All connections are made through screw terminals, with clear labelling for primary and secondary sides. The transformer does not require any maintenance and is designed for continuous duty.

Reliability and Compliance

Manufactured to Basler’s high standards, the BE 25231-001 complies with UL 5085 and IEC 61558 standards. Its encapsulated construction ensures resistance to humidity, dust, and vibration, making it suitable for harsh industrial environments.

In summary, the Basler Electric BE 25231‑001 control transformer provides dependable isolated power for generator control systems, enhancing safety and performance.