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Eaton S811+N66N3S soft starter, grey rectangular enclosure, front terminals and display

Eaton

Eaton S811+N66N3S 66 A soft starter line protection

SKU CH-8RM6-NF7PX

66 A soft starter for three-phase motors up to 600 V AC with 24 V DC control and NEMA 1 enclosure

  • Handles up to 66 A output current for heavy motor loads
  • Supports 600 V AC input and output across three-phase systems
  • Delivers 15 hp at 200 V, 20 hp at 240 V, 40 hp at 480 V, 50 hp at 575 V
  • Operates on 24 V DC control voltage for safe low-voltage signalling
  • NEMA 1 enclosure suits indoor industrial installations

Application and rating

The Eaton S811+N66N3S is a 66 A soft starter designed for three-phase motor control up to 600 V AC. It covers power ratings from 15 hp at 200 V AC through 50 hp at 575 V AC, making it suitable for industrial pump, fan and conveyor applications where reduced inrush current is required.

Thermals, noise and power

The unit operates on a 24 V DC control supply and is housed in a NEMA 1 enclosure for indoor mounting. Solid-state switching eliminates mechanical contact wear and reduces audible noise during start-up, while the integrated line protection helps limit thermal stress on the motor windings and supply cables.

Bundled accessories and software

No additional accessories, communication modules or configuration software are listed in the supplied data. The starter is delivered as a standalone device ready for hard-wired installation, so any remote monitoring or advanced parameter adjustment would require separate Eaton option cards not included here.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $3,239.99
Pricier than about 96% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON

Questions about this item

How is the 66 A soft starter mounted and wired, and what control-voltage step do installers often miss?

Mount the NEMA 1 enclosure, connect three-phase supply up to 600 V AC to the line terminals and the motor to the load terminals, then apply 24 V DC to the control terminals — forgetting the separate 24 V DC control supply is the common error.

Which components will need inspection or replacement after extended operation?

The internal power semiconductors and control-board electrolytic capacitors age with heat cycles; plan periodic visual checks and capacitor replacement per Eaton service intervals.

What thermal or current limit appears first during continuous running at full load?

The 66 A continuous output rating is the primary limit; sustained operation above this trips the built-in overload protection.

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