Lovato GMFJ400C03 is a three-pole 400 A UL98 switch disconnector with Class J fuse holders, a left command pole and a 200 kA RMS short-circuit rating with the specified fuse protection.
£2,163.63
The Lovato GMFJ400C03 is a heavy-duty three-pole switch disconnector with integrated fuse holders, designed for industrial AC isolation and circuit protection applications. Part of the Lovato GM fusible switch disconnector range, it combines load switching and isolation with accommodation for Class J UL fuses.
Rated at 400 A for both IEC and UL general-purpose applications, the GMFJ400C03 features a left command pole configuration and is certified to UL98. It supports a maximum UL operating voltage of 600 V AC and provides a short-circuit rating of up to 200 kA RMS when protected by the specified Class J 400 A fuse.
For IEC applications, the GMFJ400C03 offers a rated insulation voltage of 1000 V, impulse withstand voltage of 12 kV and operational current of 400 A in AC-21A, AC-22A and AC-23A utilisation categories at up to 690 V AC. Its robust plate-mounted construction makes it well suited to industrial switchboards, machinery and power-distribution equipment.
A fusible switch disconnector combines the isolation function of a switch disconnector with fuse holders for overcurrent and short-circuit protection. This arrangement allows the circuit to be manually disconnected while Class J fuse links provide coordinated protection against high fault currents.
The Lovato GMFJ400C03 is engineered for demanding three-phase applications requiring a 400 A fusible disconnect. Its UL98 rating, 200 kA RMS short-circuit capability with specified Class J fuses and AC-23A switching capability make it suitable for industrial feeders, motor circuits and power-distribution equipment requiring robust isolation and fuse protection.
| HS Code | 85365080 |
|---|---|
| Manufacturer | Lovato Electric |
| Series | GM |
| Model | GMFJ400C03 |
| Product designation | Switch disconnector with fuse |
| Product type | Switch disconnector with fuse holder |
| Number of poles | 3 |
| Operating voltage type | AC |
| Fuse type | Class J |
| Command pole | Left |
| IEC conventional free-air thermal current Ith at ≤40 °C | 400 A |
| IEC conventional free-air thermal current Ith at ≤65 °C | 320 A |
| Rated insulation voltage Ui | 1000 V |
| Rated impulse withstand voltage Uimp | 12 kV |
| AC-21A operational current | 400 A at 400 / 500 / 690 V AC |
| AC-22A operational current | 400 A at 400 / 500 / 690 V AC |
| AC-23A operational current | 400 A at 400 / 500 / 690 V AC |
| Rated operational power AC-23A | 220 kW at 400 V; 400 kW at 690 V |
| Rated short-time withstand current Icw (1 s) | 14 kA RMS |
| Short-circuit protection fuse | Class J / 400 A |
| AC-23A making capacity at 400 V | 4000 A |
| AC-23A breaking capacity at 400 V | 3200 A |
| Maximum power dissipation per pole | 30 W |
| Maximum fuse power dissipation | 30 W |
| Mechanical life | 5000 cycles |
| Electrical life | 1000 cycles at AC-23A, 400 V |
| Terminal type | Bar |
| Maximum terminal tightening torque | 42.5 Nm |
| Fuse-link bolt tightening torque | 20 Nm |
| Terminal lug tightening torque | 27 Nm |
| Fixing | Screw |
| Installation | Screw mounting on plate |
| Normal operating position | Vertical plane |
| Allowable mounting position | Any |
| UL standard | UL98 |
| UL general-purpose current rating | 400 A |
| Maximum UL operating voltage | 600 V AC |
| UL short-circuit rating | 200 kA RMS with Class J 400 A fuse |
| Three-phase motor rating at 240 V | 125 HP / 312 A |
| Three-phase motor rating at 480 V | 250 HP / 302 A |
| Three-phase motor rating at 600 V | 350 HP / 336 A |
| Operating temperature | -25 °C to +55 °C |
| Storage temperature | -40 °C to +70 °C |
| Maximum altitude | 3000 m |
| Frontal protection | IP20 |
| Pollution degree | 3 |
| Weight | 6600 g |
| Compliance | IEC/EN 60947-1, IEC/EN 60947-3 |
| Certification | cULus according to UL98, CSA C22.2 No. 4, EAC |
| ETIM 8.0 classification | EC000216 – Switch disconnector |
The GMFJ400C03 is a three-pole 400 A switch disconnector with integrated Class J fuse holders, designed for industrial AC switching, isolation and fused circuit protection.
The GMFJ400C03 is designed for UL Class J fuses, with a specified short-circuit protection fuse rating of 400 A.
The GMFJ400C03 has a 200 kA RMS short-circuit rating when used with the specified Class J 400 A fuse.
Under UL ratings, the GMFJ400C03 supports a maximum operating voltage of 600 V AC. Its IEC rated insulation voltage is 1000 V.
Under UL ratings, the GMFJ400C03 is rated for three-phase motors up to 125 HP at 240 V, 250 HP at 480 V and 350 HP at 600 V.
Lovato Electric GM fusible switch disconnectors provide panel builders, machine manufacturers and electrical engineers with robust switching, isolation and fuse-protection solutions for demanding industrial power-distribution systems and UL98 applications.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...