The 140U-JD0D3-D20 circuit breaker is a JD-frame circuit breaker rated for 200 Amps. It is a Bulletin 140U series molded case circuit breaker intended for use as a branch circuit and main circuit protection breaker. It can be used for short circuit and overload protection in panelboards and switchboards. Bulletin 140U circuit breakers comply with the CSA 22.2, UL 489, CCC, and CE standards. The 3-pole 140U-JD0D3-D20 circuit breaker comes with a fixed thermal and adjustable magnetic tripping module. The interrupting rating for the 140U-JD0D3-D20 circuit breaker is 100 kiloamps at 480 Volts AC. Bulletin 140U breakers support electronic and thermal-magnetic tripping modules. The current ratings for the electronic tripping modules range from 70 to 1200 Amps and the current ratings for the thermal-magnetic tripping modules range from 15 to 800 Amps. Electronic modules are available in different configurations depending on customer requirements, and LS, LSI, LSG, and LSIG are the different categories of electronic tripping modules that are available from Allen-Bradley for the 140U series circuit breakers.

Only qualified technicians who are familiar with local electrical code requirements and safety standards and experienced in the use and installation of high voltage and high current electrical devices should install and maintain the 140U-JD0D3-D20 circuit breaker. The most important precaution relating to the installation and maintenance of the 140U-JD0D3-D20 circuit breaker is that the main power supply must be disconnected before any type of work is initiated. This will help to minimize the probability of equipment damage and injury to the technicians and operators. Appropriate personal protective equipment (PPE) should be used including rubber gloves, hard hats, safety boots, and other approved protection equipment or hot-line tools.