Product Overview
Square D Class 8736 Type SB04 Contactor with Control Power Transformer Assembly
Condition
Used industrial pull mounted to a zinc-plated steel subplate. Evaluation: Visual inspection only. Function testing not performed. Markings legible: Square D Class 8736 Type SB04 Form S Series A, NEMA Size 0; coil marked 31041-400-42. Lower terminal block has two screws installed and is missing one terminal screw. Transformer primary jumper and secondary lead to contactor coil are present. Includes installed FNM dual-element fuse.
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Product Overview
Square D Class 8736 Type SBO4 (labeled SB04) open-style NEMA Size 0 contactor assembly combined with an industrial control power transformer on a common baseplate. Built for 3-phase motor control and industrial power switching, rated up to 3 HP at 200/230 VAC and 5 HP at 380/460/575 VAC (600 VAC max). Fitted with a 120V 60Hz / 110V 50Hz operating coil (part number 31041-400-42) and a multi-tap control transformer with top-mounted fuse block.
Key Features
- NEMA Size 0 rating: 3 HP at 200/230 VAC, 5 HP at 380/460/575 VAC, 600 VAC maximum
- Coil part number 31041-400-42 rated 120V 60Hz / 110V 50Hz
- Class 9998 Type SL-2 replacement contact specification
- Chassis-mounted control power transformer with primary taps H1-H4 and secondary X1-X2
- Integrated cartridge fuse holder with FNM dual-element time-delay fuse
- Formed zinc-plated steel mounting base with threaded studs
Applications
- Replacing a damaged contactor or transformer inside a legacy Square D motor control center
- Stepping down cabinet voltage to 120V control power for machine pushbuttons and relays
- Bench power switching and three-phase motor starters in custom workshop machinery
- Providing an isolated 120V control loop for industrial automation retrofits
Frequently Asked Questions
What coil voltage does this contactor require?
The contactor is fitted with Square D coil part number 31041-400-42, which operates on 120 VAC at 60 Hz or 110 VAC at 50 Hz.
What terminals are available on the control transformer?
The transformer features primary screw terminals marked H1, H2, H3, and H4, and secondary screw terminals marked X1 and X2, with an integrated fuse block on top.
What should I plan for regarding the condition and missing terminal hardware?
This is a used surplus assembly with visual inspection only. One lower contactor screw-clamp terminal screw is missing and will need to be supplied by the installer prior to wiring.
Solid Square D iron from the days of heavy-gauge panels, ready to wire into a hard-working control box.
