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JTECUL Supplemental JTEC489 Branch Rated JTEC489 DC


JTECUL MCBs are certified as ‘Supplemental Protectors’ to UL1077 (CSA235) and are intended for the overload and short circuit protection of individual control components. Supplemental devices are typically used on the load side of branch circuit devices to ‘Supplement’ the branch rated device. 

They are available in a wide range of current ratings and trip characteristics that allow them to be matched to the protection requirements of individual control devices.

JTECUL MCBs are also certified to UL508 as Manual Motor controllers and can be used for direct across the line starting of individual or groups of motors. They are marked ‘Suitable for use as motor disconnect’ to meet emerging inspection requirements. They are not intended to be used in applications requiring a Branch rated device.

JTECUL MCB’s can be matched with a wide variety of accessories

to expand their capabilities.

1/2 - 63A 277/480Vac

B, C, D Trip curves

1, 2, 3 Pole versions.


JTEC489 MCBs are approved to UL489 as ‘Branch Circuit’ overcurrent devices. In addition to having the same capabilities of the upplemental MCBs, they are also approved for use as a main incoming feeder or for field wiring applications. High 10kA interrupting rating is maintained up to 63A.

They are available in a wide variety of amp ratings and trip curves so they can be matched to the circuit requirements. JTEC489 MCBs can be used in place of Supplemental protectors.




JTEC489 MCB’s are available with a wide variety of accessories to expand their capabilities.

1/2 - 63A 277/480Vac

Note* 35-63A 240VAC

B, C, D & K Trip Curves

1, 2, 3 Pole versions.


Jtec dc circuit breaker allows usage on dc circuits up to 125Vdc in a single pole and 250Vdc with two poles in series configuration.

The JtecDC device is polarity sensitive and must be wired correctly. See illustration on page. examples to the right.






JTEC489 DC MCB’s are available with a wide variety of accessories to expand their capabilities.

0.2 - 63A 125Vdc Single Pole 10kA

250Vdc Double Pole in series 10kA

B, C, D Trip Curves

1, 2,  Pole versions.




Our staff possesses decades of in-depth application knowledge and we are eager to share it with you. All of our field engineers have control gear and fuse backgrounds, making us uniquely qualified to provide solutions to your protection problems. We offer selection software to accurately apply our products, fuse audits to help you streamline your operations, or in-house seminars to educate your personnel. Ask us! 


From the friendly voice that answers the phone, to the delivery that arrives before you expect it, we pride ourselves on delivering the absolute highest level of customer service. At Fusetek, customer service is not an empty promise but the way we do business, each and every day. Use us! 


Can’t find that unusual fuse? Not sure about a particular application? We can help. 

Our quick, knowledgeable replies get you the answers you need, when you need them.   Whether it’s technical assistance, help in finding that special fuse, or quick turnaround to get you out of a jam, we’re here for you. Call us!

Contact Us

Toll free for North America
Tel: 1-800-479-3875
Fax: 1-800-866-7690
International Tel: 1-613-384-4144 International Fax: 1-613-384-0167

Email: info@fusetek.comMailing Address: 599 Norris Crt.
Kingston, Ontario
Canada K7P 2R9