Engineered for safe DC isolation in solar systems, the Lovato GD040AT4 switch disconnector delivers reliable performance in photovoltaic applications. This direct-operating, 2‑pole unit comes complete with a black handle and supports up to 1500 V DC with Ui 1500 V and Uimp 8 kV. Rated 40 A at 1000 VDC, 32 A at 1200 VDC, and 25 A at 1500 VDC, GD040AT4 ensures dependable disconnection.
Flexible mounting on 35 mm DIN rail or screw-on plate simplifies installation in enclosures. With IP20 frontal protection, 10,000 mechanical cycles, and operation from −25 to +55 °C up to 3000 m altitude, it is built for demanding sites. Screw terminals accept 1–10 mm² conductors with 1.2–1.6 Nm tightening torque for secure, low-loss DC connections.
Key Benefits
Purpose-designed DC isolator for photovoltaic applications.
Direct-operating mechanism with black handle for clear, safe switching.
2-pole isolation up to 1500 V DC, Ui 1500 V.
Proven durability with 10,000 mechanical life cycles.
Flexible screw-plate or 35 mm DIN rail mounting.
Frontal IP20 protection for safer panel integration.
Wide −25 to +55 °C operating temperature range.
Defined DC ratings: 40A/1000V, 32A/1200V, 25A/1500V.
What’s Included
GD040AT4 switch disconnector main unit
Factory-fitted black direct-operating handle
Mounting and wiring instructions
Manufacturer datasheet (downloadable)
Applications
PV array string isolation in combiner or junction boxes
DC isolator on the photovoltaic inverter DC side
Rooftop or ground-mount solar DC distribution enclosures
Maintenance and emergency DC disconnection in PV systems
Technical Specifications
HS Code
85365080
Product type designation
GD
Number of poles
2
Operating voltage type
DC
Ith (IEC)
40 A
Rated insulation voltage Ui (IEC/EN)
1500 V
Rated impulse withstand voltage Uimp
8 kV
Power dissipation per pole (max)
1.9 W
Mechanical life
10000 cycles
Terminal tightening torque
1.2 to 1.6 Nm
Conductor section (IEC)
1 to 10 mm²
Operating temperature
-25 to +55 °C
Storage temperature
-40 to +70 °C
Max altitude
3000 m
IP degree (frontal)
IP20
Frequently Asked Questions
What DC ratings does the GD040AT4 offer for PV systems?
It is rated 40 A at 1000 VDC, 32 A at 1200 VDC, and 25 A at 1500 VDC.
How can this switch disconnector be mounted?
It mounts by screw on a plate or on a 35 mm DIN rail.
What conductor sizes and torque are supported?
Terminals accept 1–10 mm² conductors with 1.2–1.6 Nm tightening torque.
What are the environmental and protection ratings?
It has IP20 frontal protection and operates from −25 to +55 °C up to 3000 m.
Which standards does the GD040AT4 conform to?
It conforms to IEC/EN 60947-3 and IEC/EN 60947-1.
Safety note: Install and commission by a qualified electrician. Verify the DC voltage and current ratings for the application, and always isolate the supply before maintenance in accordance with the manufacturer’s instructions and relevant standards.
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...