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Filtering noise and mitigating surges prevents disruptions and protects equipment. The Model 277 provides all of this in a single unit.
Keith Wiley ▐Marketing Manager


Multi-staged design, combining a unique hybrid clamping network with the Active Tracking ▐®technology


Transient protection in all modes: line to neutral, line to ground, and neutral to ground


LED status indication and form C contact for remote indication

Reduces noise to enhance reliability while protecting equipment from surges. Learn More about our latest product updates.

The ASCO Model 277 is a series-connected high frequency noise filter and surge suppressor that is ideal for improving power quality and protecting mission-critical loads up to 20 amps.

  • Product Overview Video

    The ASCO Model 277 is a series-connected DIN or flange mounted high frequency noise filter and surge suppressor. Its ideal applications include critical industrial loads drawing up to 20 Amps of continuous current, while typical applications include any microprocessorbased products, including industrial PLCs, OEM applications, and motion control systems.

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