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Programmable Automatic Transfer Switch 2P/3P/4P 250 Amp / 2P 400 Amp

BTB type Automatic Transfer Switch integrates the programmable controller and transfer switch, saving users a lot more time on setting and installation.

It can be operated both electrically and manually; through the colored LCD display panel, all information is clear at a glance. BTB series is available for 2P/3P/4P 250Amp & 2P 400Amp system, and the system voltage is between 110V to 480V. Made with Moulded Case Circuit Breaker (MCCB) provides Over current protection. The equipped mechanical and electrical interlock protections & safety lock both efficiently prevent the personnel and gensets from potential injury or damage. With optional communication modules, users are enabled to control and monitor the gensets remotely.

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Tel: +44 (0) 115 923 2568 (United Kingdom)

Tel: (24-hour) +44 (0)7484709956 (United Kingdom)


  • Integrated programmable controller with switch save space, installation time and cost
  • MCCB type with available as Class CB / Class PC models
  • Electrical and Manual operation, Lug connections to avoid crimping
  • Safety lock to avoid injury to personnel during maintenance
  • Color LCD display allows direct input of settings
  • All phase voltage/frequency monitor & protection for Utility & Generator
  • Auxiliary contacts to indicate Utility or Generator MCCB closed
  • Adjustable central “OFF” position timer
  • Adjustable Weekly exercise timer from 1 to 4 weeks
  • Both mechanical and electrical interlock protections
  • Complies with IEC60947-6-1 and AC-33A Utilization Category
  • Optional communication modules for remote monitoring and control with a Smartphone
  • Option of English or Traditional Chinese language display
  • All fault message accompany by an audio alarm to notify the user


* Rated Frequency: 50 / 60 Hz
* Remote Start Output: 7A @ 250 Vac Max.
* Auxiliary Output: 3A @ 250 Vac Max.

Adjustable Timer Settings

* TDNE Time Delay Normal to Emergency: 0 to 250 seconds
* TDES Time Delay Engine Start: 0 to 15 seconds
* TDEN Time Delay Emergency to Normal: 0 to 999 seconds
* TDEC Time Delay Engine Cool-down: 0 to 250 seconds
* TDOF Time Delay in OFF position: 0 to 99 seconds

Operating Environment

* Operating Temperature: -20 to +70 °C
* Storage Temperature: -30 to +80 °C
* Relative Humidity: Less than 90%

Physical Specifications

* Dimensions: 2P:225.0 (L) x 293.0 (W) x 170.0 (H) mm
3P:225.0 (L) x 293.0 (W) x 170.0 (H) mm
4P:225.0 (L) x 293.0 (W) x 205.0 (H) mm