Description
The Siemens MT0250B is a 250VA control transformer engineered to deliver dependable, low-voltage power for HVAC control circuits and building automation systems. Stepping down a 240/480V primary supply to a 24V secondary output, this transformer is a trusted solution for powering thermostats, relays, contactors, and other control devices in commercial and residential HVAC applications.
Built to Siemens’ exacting quality standards, the MT0250B provides stable, consistent secondary voltage to protect sensitive control electronics and ensure reliable system operation. Its robust construction is designed for long service life in demanding mechanical room and panel environments.
Key Features
- 250VA transformer capacity for powering a wide range of HVAC control loads
- Primary voltage: 240/480V — compatible with common single-phase commercial power supplies
- Secondary voltage: 24V — standard low-voltage output for HVAC control circuits
- Designed for use with thermostats, relays, contactors, zone panels, and building automation controls
- Siemens quality construction for long-lasting, dependable performance
- Suitable for commercial and light industrial HVAC control applications
Specifications
- SKU: MT0250B
- Brand: Siemens
- VA Rating: 250VA
- Primary Voltage: 240/480V
- Secondary Voltage: 24V
Applications
- HVAC control panel power supply
- Building automation and energy management systems
- Commercial thermostat and zone control circuits
- Relay, contactor, and actuator control power









