Littelfuse
Littelfuse JTD 10 A 600 VAC Class J Time Delay Fuse
A 10 A Class J time-delay fuse rated for 600 V AC and 300 V DC with a 200 kA AC interrupt rating
- 10 A 600 V AC rating protects industrial circuits
- Time-delay characteristic prevents nuisance trips on motor start-up
- 200 kA AC interrupt rating clears high fault currents safely
- Class J form factor fits standard LFJ fuse blocks
- Melamine cylindrical body resists heat and vibration
Circuit protection role
The Littelfuse JTD series fuse provides 10 A rated current protection at 600 V AC and 300 V DC for industrial and commercial electrical circuits. It fits Class J fuse blocks such as the LFJ series and serves as a direct replacement for Bussmann LPJ and Mersen AJT equivalents. The cylindrical melamine body measures 2-1/4 in length by 13/16 in diameter. This non-indicating, time-delay device suits motor-start and transformer inrush applications.
Sustained-load behaviour
Time-delay construction allows the element to withstand temporary overloads from motor starting or transformer energising without nuisance opening. The dual-element design separates overload and short-circuit response, so sustained currents above 10 A eventually open the fuse while brief inrush peaks pass. Interrupting capacity reaches 200 kA at 600 V AC and 20 kA at 300 V DC, clearing high-energy faults before downstream equipment is damaged.
Thermal and power profile
Under normal rated current the fuse runs at a low, steady temperature rise within the melamine body, adding negligible heat to the enclosure. No moving parts or ventilation are required, so acoustic output is zero. Power dissipation stays within Class J limits for the 10 A rating, keeping voltage drop minimal across the 2-1/4 in length. The non-rejection body style fits standard Class J blocks without modification.
Highlights
- 10 A 600 V AC rating protects industrial circuits
- Time-delay characteristic prevents nuisance trips on motor start-up
- 200 kA AC interrupt rating clears high fault currents safely
- Class J form factor fits standard LFJ fuse blocks
- Melamine cylindrical body resists heat and vibration
Specifications
| Brand | Littelfuse |
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Questions about this item
Does the 10 A Class J fuse generate noticeable heat or noise when running continuously?
The fuse operates silently and produces only normal resistive warmth at its rated 10 A load; it has no moving parts or active cooling.
What fuse block or holder must I already own to install this 13/16 in diameter cylindrical fuse?
A Class J compatible fuse block such as the LFJ series that accepts a 2-1/4 in long, 13/16 in diameter cylindrical body.
Will this 200 kA interrupting rating fuse coordinate with older 600 VAC equipment still on the same circuit?
Its 200 kA AC and 20 kA DC interrupt ratings provide high short-circuit protection suitable for legacy 600 VAC systems.
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