Fuse JJN (Class T) 400 Amp

Protect demanding DC electrical circuits with a fast-acting Class T fuse designed for high-amperage electronics equipment. Ideal where quick short-circuit interruption helps safeguard equipment such as inverters.

Key Features

• Fast short circuit response helps protect high amperage electronics equipment such as inverters.
• 20,000 Amp Interrupt Capacity (AIC) UL rated for DC applications under UL189L.

Intended Use

• High-amperage DC power distribution circuit protection (fuse protection for inverter-type systems and other demanding DC loads).
• Use with Class T fuse blocks/fuse holders intended for Class T fuses.

Product Details

• Fuse type: Class T
• Fuse designation: JJN
• Rated current: 400 Amp
• Interrupt rating: 20,000 Amp (AIC)
• UL rating: UL189L (DC applications)
• Part / SKU: 661-5121

Parts Desk Insights

Best Use Case: Best suited for DC circuits where rapid short-circuit protection is importantcommonly in inverter and other high-capacity DC power setups that use Class T fuse protection.

Common Issues: If a fuse keeps opening, confirm the circuit load/inrush characteristics and inspect wiring and connections for loose/overheating contacts. Also verify the fuse block/fuse holder is specifically rated for Class T fuses and matches the intended fuse rating.

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• Fuses – Browse Class T fuse blocks and related fuse protection components to match this fuse to the correct holder.