ABB S273-K40 Circuit Breaker, 40A, 3-Pole, 400V

The ABB S273-K40 is a rugged, industrial-grade circuit breaker designed to safeguard three-phase electrical systems. With a 40 A rating and a 3-pole configuration, this unit is tailored for demanding industrial service, maintenance, and replacement projects operating at up to 400 V. Built for reliability in tough environments, it delivers dependable overcurrent protection when you need to keep motors, feeders, and distribution circuits safe from faults.

Why the S273-K40 stands out

• Three-pole protection for 3-phase systems: ensures synchronized interrupting across all phases, ideal for motor loads and three-phase equipment common in manufacturing and processing facilities.
• 40 A continuous rating: provides precise overload protection for medium-load circuits, reducing the risk of unwarranted trips and equipment damage.
• 400 V compatibility: designed to integrate smoothly with industrial power networks that run on 3-phase, 400 V systems, facilitating straightforward panel replacement and upgrades.
• ABB engineering lineage: backed by ABB’s proven track record in durable, manufacturable protection devices, aimed at minimizing downtime and simplifying maintenance planning.
• Part-number driven compatibility: identified by S273-K40—verify fit by part number and application requirements to ensure a correct, reliable replacement.

Practical use cases

• Replacing worn or failed breakers in production lines, packaging equipment, and processing plants to restore quick, safe operation.
• Upgrading distribution panels to accommodate new machinery or increased motor loads without sacrificing protection reliability.
• Maintenance projects where precise plug-and-play compatibility with current panels minimizes downtime and installer effort.

Specifications at a glance

• Manufacturer: ABB
• Part number: S273-K40
• Product type: Circuit Breaker
• Amperage: 40 A
• Poles: 3
• Voltage: 400 V

Need help confirming the right fit for your exact panel and application requirements? Our team can assist with part-number verification and ensure the S273-K40 matches your system’s specifications, so you can source with confidence and minimize project risk.