BTPC Bypass Isolation Transfer Switch Open or Closed Transition
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Specification Sheet BTPC Bypass Isolation Transfer Switch Open or Closed Transition 150 – 4000 Amps Description BTPC bypass isolation transfer switches combine a draw out automatic transfer switch with isolation mechanism and a manual bypass switch, to provide redundant power transfer and re-transfer capability for critical need applications requiring a reliable power supply to the load. BTPC switches are available with closed transition for transferring critical loads without interruption. PowerCommand® control: A fully featured Microprocessor based control with digital display. Controls allow operator to enter settings and make adjustments to software enabled features easily and accurately. Accommodates up to 8 event schedules. Like conventional transfer switches, BTPC transfer switches are designed for operation and switching of electrical loads between primary power and Standby generator sets. The switch monitors both power sources, signals generator set start up, automatically transfers power and returns the load to the primary power source when the utility returns and stabilizes. Closed transition available: By briefly connecting the two sources (for 100 msec or less), the transfer from the alternate source back to the normal source occurs without Interruption in the power supply to loads. Programmed transition: Open transition timing can be adjusted to completely disconnect the load from both sources for a programmed time period, as recommended by NEMA MG-1 for transfer of inductive loads. Closed door draw out operation: Bypass and total isolation of the automatic transfer switch occurs behind closed doors, to provide arc flash protection for operator. For critical loads: Suitable for use in emergency, legally required and optional Standby applications.

BTPC Bypass-Isolation Transfer Switch Advanced transfer switch mechanism: Unique bi-directional linear actuator provides smooth, Continuous transfer switch action during automatic operation. Robust control system design: Optically isolated logic inputs and isolation transformers for AC power inputs provide high-voltage surge protection. Main contacts: Heavy-duty silver alloy contacts and multi-leaf arc chutes are rated for motor loads or total system load transfer. They require no routine contact maintenance. Continuous load current not to exceed 100% of switch rating and Tungsten loads not...

Transfer Switch Mechanism Bypass Mechanism • Transfer switch mechanism is electrically operated and mechanically held in the Source 1 and Source 2 positions. The transfer switch incorporates electrical and mechanical interlocks to prevent inadvertent interconnection of the sources. • Independent break-before-make action is used for both 3pole and 4-pole/ switched neutral switches. This design allows use of sync check operation when required, or control of the operating speed of the transfer switch for proper transfer of motor and rectifier-based loads (programmed transition feature). • True...

PowerCommand Control PowerCommand controls are microprocessor based and developed specifically for automatic transfer switch operation. The control includes the features and options required for most applications. • Flash memory stores the control settings. • Contents of the memory are not lost even if power to the controller is lost. • On-board battery maintains the real-time clock setting and the engine start time delay. Panels Basic indicator panel: Source available/connected LED indicators Test/exercise/bypass buttons Digital display: Standard Analog bar graph meter display: optional...

PowerCommand Control (continued) Time-Delay Functions User Interface Options Engine start: Prevents nuisance genset starts due to momentary power variation or loss. Not included in utilityto-utility systems. Transfer normal to emergency: Allows genset to stabilize before application of load. Prevents power interruption if normal source variation or loss is momentary. Allows staggered transfer of loads in multiple transfer switch systems. For genset-to-genset applications, delays transfer of load from lead to secondary generator. Re-transfer emergency to normal: Allows the utility to...

Specifications Voltage rating Multiple leaf arc chutes provide dependable arc interruption. A full current-rated neutral bar with lugs is standard on enclosed 3-pole transfer switches. Auxiliary contacts Two isolated contacts (one for each source) indicating switch position are provided for customer use. Contacts are normally open, and close to indicate connection to the source. Wired to terminal block for easy access. Rated at 10 amps Continuous at 250VAC maximum. UL recognized and CSA-certified. Operating temperature Storage temperature Surge withstand ratings Voltage surge performance...

Transition Modes Open transition/programmed: Controls the time required for the device to switch from source to source, so that the load-generated voltages decay to a safe level before connecting to an energized source. Recommended by NEMA MG1 to prevent nuisance tripping breakers and load damage. Adjustable 0-10 seconds, default 0 seconds. Programmed transition is standard on 150-1000 amp switches, and optional on 1200-4000 amps. Open transition/in-phase: Initiates open transition transfer when in-phase monitor senses both sources are in phase. Operates in a break-before-make sequence....

UL Withstand and Closing Ratings The transfer switches listed below must be protected by circuit breakers or fuses. Referenced drawings include detailed listings of specific breakers or fuse types that must be used with the respective transfer switches. Consult with your distributor/dealer to obtain the necessary drawings. Withstand and Closing Ratings (WCR) are stated in symmetrical RMS amperes. MCCB protection Transfer switch ampere WCR @ volts max with specific manufacturers MCCBs Special circuit breaker protection Drawing reference With specific current limiting breakers (CLB) Drawing...