Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
GMFJ400C03 Lovato 3P SWITCH DISC. W/FUSE HOLDER J 400A C03
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.
£1,730.90
Why Choose the Lovato GMFJ400C03 400 A Fusible Switch Disconnector?
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.
Key Advantages
- Combines switch disconnection and Class J fuse accommodation in one device.
- 400 A UL general-purpose current rating to UL98.
- Three-pole design for industrial three-phase AC systems.
- High 200 kA RMS UL short-circuit rating with Class J 400 A fuse protection.
- Supports AC-21A, AC-22A and AC-23A utilisation categories at 400 A.
- 1000 V insulation voltage and 12 kV impulse withstand voltage.
- Left command pole configuration for compatible operating accessories.
- cULus certified according to UL98 / CSA C22.2 No. 4.
Key Features
- Three-pole fusible switch disconnector.
- Class J UL fuse type.
- 400 A conventional free-air thermal current at temperatures up to 40 °C.
- 320 A conventional free-air thermal current at temperatures up to 65 °C.
- 600 V AC maximum UL operating voltage.
- Left command pole arrangement.
- Bar-type main terminals.
- Screw fixing for plate-mounted installation.
- IP20 frontal protection.
- Mechanical endurance of 5000 operating cycles.
High-Current Switching with Integrated Fuse Protection
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.
Typical Applications
- Industrial power-distribution switchboards.
- UL98 fusible disconnect installations.
- Three-phase motor and machinery isolation.
- Industrial feeder and branch-circuit switching.
- OEM machinery and control panels.
- High fault-current installations requiring Class J fuse protection.
Technical Specifications
Tick the specs you need, then view products that match.
| Device Type | Fuse switch disconnector | |
|---|---|---|
| Power | 220 kW | |
| Poles | 3-pole | |
| 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 |
Frequently Asked Questions
What is the Lovato GMFJ400C03?
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.
What type of fuse does the GMFJ400C03 use?
The GMFJ400C03 is designed for UL Class J fuses, with a specified short-circuit protection fuse rating of 400 A.
What is the UL short-circuit rating of the Lovato GMFJ400C03?
The GMFJ400C03 has a 200 kA RMS short-circuit rating when used with the specified Class J 400 A fuse.
What is the maximum operating voltage of the GMFJ400C03?
Under UL ratings, the GMFJ400C03 supports a maximum operating voltage of 600 V AC. Its IEC rated insulation voltage is 1000 V.
What motor loads can the GMFJ400C03 switch?
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.
Trusted by Industrial Panel Builders Worldwide
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.
