PULS Announces NEC Class 2 Compliant Electronic Circuit Breakers

Power supply specialist PULS has announced new additions to its PISA-M series of electronic circuit breakers. The new models, available with UL approval, will serve as an efficient solution for creating multiple low-power NEC Class 2 circuits from a single power source. PULS expects that its newest PISA-M series additions will help manufacturers and system integrators reduce costs, save space, and streamline system approvals.

NEC Class 2 Circuits

NEC Class 2 circuits are widely used in industrial and automation systems because they impose strict limits on voltage and power, significantly reducing the risk of electrical shock and fire. Typically, creating Class 2 circuits requires multiple independently approved power supplies, which increases costs, complicates installation, and consumes valuable space in control panels.

The new PISA-M circuit breaker helps to save space in electrical cabinets by allowing up to four NEC Class 2 connections from a single source. Image used courtesy of PULS

PISA-M Electronic Circuit Breakers

PULS has looked to address these challenges with its new PISA-M electronic circuit breakers. These devices allow a single 12 V or 24 V power supply to split its load into four protected Class 2 circuits. As a result, users can meet compliance requirements with fewer power supplies, less wiring, and lower overall system costs. For installations needing more than four Class 2 circuits, multiple PISA-M modules can be connected, offering modular scalability without sacrificing safety or cabinet space.

One of the standout features of the new PISA-M variants is their extremely compact design: each unit measures only 22.5 mm wide. This ultra-slim profile allows it to fit easily into densely packed control cabinets, freeing up valuable space for other critical system components. The housing is made from durable polycarbonate, ensuring long-term reliability even in demanding industrial environments.

Depending on application requirements, customers can choose from two NEC Class 2 compliant variants, the PISA-M-4CL2 and the PISA-M-402. Both models are designed to be easily integrated into either 12 V or 24 V systems without manual configuration, thanks to automatic voltage detection.

PISA-M-4CL2

The PISA-M-4CL2 adjusts tripping currents automatically, depending on the system voltage. It delivers up to 3.75 A per channel at 24 V (maximum 92 W) and 4.85 A per channel at 12 V (maximum 60 W). Regardless of voltage, the output remains within the Class 2 safety limits, ensuring reliable protection without user intervention.

Both the PISA-M-402 and the PISA-M-4CL2 feature a compact size of 22.5 x 104 x 98 mm. Image used courtesy of PULS

PISA-M-402

The PISA-M-402 provides a fixed low output current of 2 A per channel at 24 V (maximum 48 W) or 12 V (maximum 24 W). Designed for sensitive applications, it is ideal for protecting delicate components like sensors and other low-current devices that require consistent, tightly controlled power.

Simplifying Power Distribution

By consolidating multiple circuits into a single unit, the PISA-M series reduces both hardware costs and the complexity of meeting regulatory requirements. Instead of purchasing and certifying multiple NEC Class 2 compliant power supplies, system designers can now use a single supply combined with a PISA-M module to achieve the same level of safety.

The new models also support UL certification, giving manufacturers and machine builders confidence that their systems will pass necessary inspections and audits. With their compact footprint, flexible output options, and built-in NEC compliance, the new PISA-M electronic circuit breakers are positioned to become a good solution for safe, efficient power distribution in modern automation and control systems.