IMO IS4P40 40A 4-Pole Enclosed Rotary Isolator – IP65 Rated High-Power AC Disconnect

This is the IMO IS4P40 40A 4-Pole Enclosed Rotary Isolator – a IP65 Rated High-Power AC Disconnect available at SparksDirect for the best price. Purchase this item with confidence at Sparks today.

The IMO IS4P40 is a mid-range, 4-pole enclosed rotary isolator from the Stag range. It is designed for heavier AC loads in residential and commercial settings, offering a higher current rating than standard 20A models while maintaining a compact, weatherproof form factor. 

The IMO IS4P40 is a durable, surface-mounted rotary switch used for the manual isolation of electrical circuits. With a robust 40A rating, it is capable of switching all three phases and the neutral, making it a critical safety component for large solar PV arrays, commercial HVAC systems, and high-power industrial motors. The unit is housed in a high-impact, flame-retardant polycarbonate enclosure with an IP65 rating, providing complete protection against dust and water ingress.

Designed for safety and compliance, the enclosure features an interlocked lid that cannot be removed while the switch is in the "ON" position. The high-visibility red and yellow handle is padlockable in the OFF position, ensuring strict adherence to Lockout/Tagout safety protocols during maintenance. The IS4P40 includes dual 20mm and 25mm knockouts for flexible entry, allowing for easier installation with the thicker cables required for 40A loads.

Technical Specifications

• Model Number: IS4P40
• Type: Enclosed Rotary Isolator / Switch Disconnector
• Number of Poles: 4 Pole
• Rated Current: 40A (AC21)
• Motor Rating: 15kW at 415V (AC23A)
• Rated Voltage: 415V AC
• Insulation Voltage: 690V
• Ingress Protection: IP65 Enclosure / IP20 Body
• Dimensions: 175mm (H) x 115mm (W) x 100mm (D)
• Max Cable Size: 10mm²
• Tightening Torque: 1.2Nm (Contacts) / 2Nm (Lid)
• Standards: IEC/EN 60947-3, UKCA, CE, SEMKO

Frequently Asked Questions

Q: Why is this box larger than the 20A version?

A: The IS4P40 uses a larger enclosure (175mm high) to provide more internal space. This is necessary for managing the larger 10mm² cables and dissipating the heat generated by a 40A load safely within the box.

Q: Can I use this for a 3-phase system with a Neutral?

A: Yes. This is a true 4-pole device, meaning it switches the three phases (L1, L2, L3) and the Neutral simultaneously, providing complete isolation for a standard 400V/415V 4-wire system.

Q: Is this suitable for outdoor installations?

A: Yes. The enclosure is IP65 rated and made from UV-stabilized, flame-retardant polycarbonate, making it highly resistant to rain, snow, and sunlight on exterior walls.

Who can install this?

Installation must be performed by a qualified electrician. Because it handles up to 40A, it is essential that all wiring is correctly sized and that the terminals are tightened to the manufacturer's specified torque of 1.2Nm. Incorrect torque at these current levels can lead to high resistance, localized heating, and potential thermal damage.

What is this for?

The IMO IS4P40 is a standard solution for High-Power AC Isolation:

• Commercial Solar PV: Serving as the primary AC disconnect for large string inverters in commercial solar installations.
• Industrial HVAC: Providing localized safety isolation for large air handling units, chillers, and rooftop condensers.
• Commercial Kitchens: Used as the main isolator for heavy-duty electric ovens and walk-in refrigeration systems.
• Medium-Sized Motors: Manual isolation for industrial equipment, including pumps, conveyors, and larger workshop machinery up to 15kW.

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