ABB UK624E3 Solar PV Junction Box / Combiner Box, model UK624E3, for photovoltaic string connections

ABB UK624E3 is a consumer unit / combiner (junction) box intended for indoor installation in photovoltaic systems. It provides a protected enclosure for combining multiple PV strings and routing DC outputs to inverters. The enclosure is made of thermoplastic with a powder-coated metal door in RAL 9016, has IP30 protection, class II double insulation and a 120° opening door with TIP-in closure. The unit accepts top, bottom, side and rear cable entry via pre-punched slide parts and rear knockouts, and includes an assembled device carrier with removable device support and integrated cable fastening rail.

Advantages

The ABB UK624E3 combines a compact 24-space thermoplastic enclosure with a metal trim frame and powder-coated steel door for improved durability. It meets relevant standards (EN 60670-24), offers IK07 impact resistance and glow-wire resistance up to 850 °C. The unit includes N/PE screw terminals, a 90° press-and-turn closure for covers, and is delivered assembled with device carrier and removable support for easier installation and maintenance.

Suitable for

• Indoor photovoltaic combiner/junction box installations
• Combining multiple PV strings and routing DC outputs to inverters
• Small to medium rooftop or commercial solar projects requiring a compact consumer unit
• Installations requiring pre-punched cable entry points for top, bottom, side and rear wiring

When it may not be suitable

This unit has an IP30 rating and is designed for internal use only, so it is not suitable for outdoor installations or environments with high humidity, dust or water exposure. It also lacks integrated AC distribution and is intended for DC combiner functions; projects needing full AC distribution boards or higher ingress protection should choose a different enclosure.

Key specifications

• Rated operational voltage: 400 V AC, 50/60 Hz
• Rated current: 63 A
• Degree of protection: IP30 (for indoor use)
• Protection class: II (double insulated)
• Impact resistance: IK07
• Glow-wire resistance: 850 °C
• Material: thermoplastic enclosure with sheet steel door and metal trim frame
• Finish: powder-coated, RAL 9016
• Dimensions (H x W x D): 497 x 384 x 97 mm
• Shutter frame dimensions (H x W x D): 497 x 384 x 9 mm
• Space units: 24; row distance: 125 mm
• Door opening angle: 120°; hinge reversible (right or left)
• Cable entry: top, bottom, side and rear pre-punched/slide parts
• Covers: plastic with 90° press-and-turn closure

How to use

Mount the ABB UK624E3 indoors on a suitable flat surface or DIN-compatible mounting position ensuring sufficient clearance for the 497 x 384 x 97 mm enclosure. Select the appropriate pre-punched cable entry points (top, bottom, side or rear) and remove slide parts as required. Fit PV string cables to the internal combiners and N/PE to the supplied screw terminals, secure conductors using the integrated cable fastening rail, and install overcurrent protection devices on the assembled device carrier. After wiring, close the metal door (TIP-in closure) and check the door hinge orientation and tightness of terminals before energising.

What to consider before purchase

• Intended use is indoor only (IP30) — not suitable for outdoor or wet locations
• Verify the 63 A rated current and 400 V AC operational voltage match system requirements
• Ensure 24 space units and the physical dimensions fit the planned installation area
• Confirm requirement for thermoplastic enclosure with metal door and RAL 9016 finish

Usage recommendations

Use the ABB UK624E3 as a DC combiner/junction box inside buildings or equipment rooms; install overcurrent protection devices appropriate to PV string currents, route cables through the designated pre-punched entries, and follow local electrical codes and inverter manufacturer guidance when connecting DC outputs to inverters.