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Cutler Hammer ST 3 - 30A 600V AC Non-Fusible Disconnect Switch

Cutler Hammer
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The Cutler Hammer ST 3 is a 3-pole, 600V AC industrial-duty disconnect switch designed for reliable circuit isolation and safety lockout in motor control centers and panelboards. It is rated for 30A continuous current and features a compact NEMA 1 enclosure measuring 1.72 in x 1.72 in x 1.99 in (Length/Depth x Height x Width) with a weight of 0.4 lb, constructed from durable steel with a gray polyester powder coat finish. The switch utilizes a non-fusible, quick-make/quick-break mechanism with a red handle and padlockable operating handle for secure lockout/tagout compliance. It meets UL 98 and CSA C22.2 No. 4 standards for disconnect switches and is suitable for general-purpose industrial applications including motor disconnection, machinery isolation, and branch circuit protection. Typical uses include controlling conveyors, pumps, fans, and other heavy machinery in manufacturing, processing, and utility environments.

Key Features & Specifications
  • Type: Non-fusible, heavy-duty disconnect switch with quick-make/quick-break mechanism
  • Voltage Rating: 600V AC
  • Current Rating: 30A
  • Dimensions: 1.72 in x 1.72 in x 1.99 in (Length/Depth x Height x Width)
  • Standards: UL 98, CSA C22.2 No. 4
  • Applications: Motor disconnection, machinery isolation, branch circuit protection
  • Switch Type: Non-fusible disconnect
  • Configuration: 3-pole, single-throw
  • Coil Voltage Maximum: Not applicable (manual switch)
  • Temp Rating: -20°C to 60°C
  • Shipping Dimensions: 2.5 in x 2.5 in x 3.0 in
  • Phase: 3-phase
  • Voltage: 600V AC
  • Amperage: 30A
  • AIC rating: 10kA at 600V AC
  • Connection: Screw terminals
  • Poles: 3
  • Protection: Overload and short-circuit (with external fuse)
  • Functions: Disconnect, lockout
  • Frame Size: ST
  • Trip Type: Not applicable (non-fusible)
  • Panel Type: NEMA 1
  • Breaker Type: Not applicable
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Steel
  • Panel Style: Surface mount
  • Bus Type: Not applicable
  • Fuse Class: Not applicable
  • Insulation Temperature: 105°C
  • Inductance: Not applicable
  • Impedance: Not applicable
  • Barrels: Not applicable
  • Class Rating: Not applicable
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not applicable
  • Clas: Not applicable
  • Mounting: Surface
  • Hz: 50/60
  • Coil Material: Not applicable
  • Horse Power: 7.5 HP at 600V AC
  • Aux Contacts: 1 NO/NC (optional)
  • CPT: Not included
  • Full Load Amps: 30A
  • Dist Voltage: 600V AC
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 30A
  • Full Load Amp Minimum: 0A
  • Enclosure: NEMA 1
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Copper/Aluminum
  • Amperage Maximum: 30A
  • Amperage Minimum: 0A
  • Nema Rating: 1
  • Switch Style: Rotary handle
  • Wire Size: 14 AWG to 4 AWG
  • Certification: UL, CSA
  • Circuit Breaker Mounting Style: Not applicable
  • Terminal Connection: Screw
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-phase
  • Standards: UL 98, CSA C22.2 No. 4
  • Compatible Frames: ST series
  • Installation Type: Surface
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: Not applicable
  • Current Rating: 30A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not applicable
  • Peak Pulse Current: Not applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not applicable
  • Breakdown Voltage (VBR@IT) (V): Not applicable
  • Polarity: Not applicable
  • Operating Temperature Maximum Celsius: 60°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 784731100054