ABB Pro M compact busbar system from ABB Ltd - tidy low voltage distribution for DIN rails

Reviewed: ad hoc news Accessory & Components desk. Edited and checked on 2026-06-24, 00:39. Details in the imprint.

ABB Pro M compact busbar system from ABB Ltd looks almost modest at first glance, just a row of copper teeth under a line of miniature circuit breakers on a DIN rail. But an installer like Maria Keller feels the difference the moment she snaps the first MCB in place.

What the busbar does

The Pro M compact busbar system is ABB's modular way to feed multiple Pro M miniature circuit breakers, RCDs and other low voltage devices in one go, instead of looping single wires between terminals. On a crowded distribution board, that means fewer loose conductors and a visibly cleaner layout.

ABB offers the system in single, two, three and four-pole versions, tailored to its Pro M line of devices, so panel builders can choose a bar that matches their breaker configuration rather than cutting generic copper combs. According to ABB's low voltage portfolio, the Pro M family targets residential, commercial and light industrial installations worldwide.

Why electricians like it

Ask an electrician, and the first thing they mention is speed. With a comb busbar, they can line up a dozen breakers, torque the main feed once, and be done with phase distribution in minutes instead of threading and labelling twelve short jumpers.

Inside a metal enclosure, the difference is tactile too: instead of a handful of stiff copper wires pushing back, the Pro M compact bar lies flat under the terminals. When the door closes, nothing scrapes the sheet metal, nothing bulges the front.

Technical details and limits

Depending on variant, ABB's Pro M compact busbars are designed for typical low voltage ratings found in building installations, with currents tailored to the downstream Pro M breakers they feed. The spacing and tooth geometry match ABB's own terminal pattern, which keeps touch protection consistent across the board.

That tight integration is convenient but also the main limitation. The bars are meant for ABB Pro M devices, not as universal combs for mixed brands, so panel builders standardising on one manufacturer will benefit most.

Use cases from homes to light industry

In a German apartment block, the system often sits behind a plain white plastic cover, feeding a row of 16-amp lighting and socket circuits without a single visible loop wire. In a small machine cabinet, it can distribute control power to contactor coils and PLC auxiliaries just as neatly.

ABB positions its low voltage products as part of a modular ecosystem that spans miniature breakers, residual current devices, surge protection and accessories, so the same Pro M busbar concept can follow electricians across different project types and markets.

Where it could annoy

For all its clean lines, the system is not immune to frustration. If a late design change forces a different pole pattern or an extra device in the middle of the row, the pre-cut bar segments may not match, and installers have to improvise or reorder.

Some panel builders also argue that proprietary combs tie them more tightly to one supplier's product roadmap and pricing than individually wired solutions, especially on long-term industrial platforms.

Stock context and listing

ABB uses seemingly small components like the Pro M compact busbar system to round out its electrification portfolio, next to higher-profile drives, robots and power equipment. ABB shares (ISIN CH0012221716) trade on SIX Swiss Exchange in Swiss francs.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.