Product Description

Circuit breaker power supply

The Vanguard UPS S3 is an AC/DC adjustable output power supply designed to operate substation circuit breakers. The UPS S3’s AC and DC voltage sources can supply up to 10 Amperes during the circuit breaker coil energization and circuit breaker charging motor operation. Powered by a single phase 90-120 Vac voltage source, the UPS S3 provides an isolated adjustable AC/DC voltage source. Output voltages are variable via the front panel control knob.

The unit’s variable AC output voltage source (10-140 Vac) is rated at 140 Vac @ 9A continuous. It is also full-wave rectified and filtered to provide an isolated DC voltage source. The DC voltage source (10-200 Vdc) is rated at 180 Vdc@9A (2 seconds) or 180 Vdc @ 2A continuous. Both AC/DC voltage source outputs are protected by a circuit breaker.

A built-in dual volt meter displays both AC and DC voltage simultaneously on a back-lit LCD screen (128 x 64 pixels) that is viewable in bright sunlight and low light levels. Both AC and DC voltage displays range from 0-200 Vrms. The UPS S3 is housed in a plastic enclosure (17.5” x 12.5” x 11.7”) and weighs 45 lbs. (20.4 Kg). A power cord, safety ground cable and voltage connection leads are included.

• AC/DC adjustable output power supply designed to operate substation circuit breaker
• Can supply up to 10 A during the circuit breaker coil energization and circuit breaker charging motor operation
• Variable AC output voltage source (10-140 Vac) rated at 140 Vac @ 9 A continuous
• DC voltage source (10-200 Vdc) rated at 180 Vdc@9 A (2 seconds) or 180 Vdc @ 2 A continuous
• Both AC & DC voltage source outputs protected by a circuit breaker