The Allen-Bradley 140U-D6D3-C15 is a molded case circuit breaker. This circuit breaker is recommended by Allen-Bradley for use in Feeder Circuits such as small cabinets, distribution panels, branch circuit protections of Variable Frequency Drives (VFD), Servo Motor drives and Motors; Transformers and heaters. It is also applicable in control circuits for isolation of control transformers and power supplies. It is also compatible in Heating, air conditioning and refrigeration (HACR) applications. This circuit breaker has high switching duty rated between 15 & 20 A and high-intensity-discharge of 0.5 - 25 A.

The 140U-D6D3-C15 is a 3-pole breaker ideally used in 3-Phase applications. Being part of the 140U-D breaker series, the 140U-D6D3-C15 has an inherent current limiting feature, enabling short-circuit and overcurrent protection with high-interrupt ratings. This breaker is certified UL489 breaker and built with compact, small footprint assembly.

This circuit breaker supports installation of Load terminal cover, Three-Phase Compact Busbar 45mm spacing, Feeder Terminal for compact busbar, Eco Connection Module - 25A, Flexible Wire Module - 32A and Extension Shaft Support. This circuit breaker has a rated current of 15 Amperes and magnetic trip of 15- 20xIn. Additionally, it has varying braking capacity according to input voltage. At Frequency of 50 Hz, this breaker has breaking capacity of 65 kA (lcu) and 50 kA (Ics) for 400-415V and 525 V and 10 kA (lcu) and 6 kA (Ics) for 690VAC. The breaker’s interrupting frequency on the other hand is 65 kA for 240VAC; 65 kA for 480Y / 277V and 25 kA for 600Y / 347V.

The applications for which the 140U-D6D3-C15 circuit breaker is used include control circuits for control transformers and power supplies, feeder circuits for branch circuit protection, heaters, and small cabinets. The 140U-D6D3-C15 circuit breaker is UL489 listed and CE marked. The unit is used globally and it complies with all of the relevant standards in regard to protection requirements. The unit has a switching frequency of up to 25 operations per hour and a lifespan of 100,000 mechanical and 10,000 electrical operations. This circuit breaker does not have protection from phase losses. The applications for which the circuit breaker is used should be in accordance with requirements from the IEC61439-1 standards. The 140U-D6D3-C15 circuit breaker is not intended for use near corrosive gases, explosive gases, or high amounts of dust. The unit has advanced safety features and it belongs to Utilization Category A that complies with the IEC 60947-2 standards for circuit breakers. The 140U-D6D3-C15 circuit breaker is HACR rated and it comes with 3 poles. The rated insulation voltage according to the IEC/EN standards is 690 Volts and it is 600 Volts according to the UL/CSA standards. The device has up to 400 Volts of safe separation between main and auxiliary circuits and a rated frequency of 50 to 60 Hertz. The high interrupting rating of the unit includes 65 kiloAmps at 240 Volts/480Y/277 Volts and 25 kiloAmps at 600Y/347 Volts. In addition to that, the 140U-D6D3-C15 circuit breaker has a 15 Amps rated current and magnetic trip [Amp] rating of 15 to 20 x In.