The fastest way to find, compare and buy Dayton capacitor-start/run motors.
Describe the HP, frame size, or equipment you need to power. ChatMRO finds the exact Dayton match, shows alternatives, and gives you a quote — in seconds. No part number needed.
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AI-generated imageA capacitor-start/run motor is a single-phase AC induction motor that uses two capacitors — a start capacitor for high initial torque and a separate run capacitor that stays in the circuit continuously during operation — to improve both starting torque and running efficiency compared to a plain capacitor-start motor, which disconnects its capacitor once the motor reaches speed. This dual-capacitor design gives smoother, quieter running with better power factor and torque characteristics under sustained load.
Facilities technicians, pump and compressor installers, and OEM equipment builders rely on Dayton capacitor-start/run motors wherever equipment needs both strong starting torque and efficient continuous running torque — pumps, compressors, blowers, conveyors, and other loads that mount directly to a NEMA C-face or connect via a rigid base. Their combination of high starting torque (for hard-to-start loads) and steady running performance (for continuous-duty equipment) makes this motor design a preferred general-purpose replacement wherever a plain split-phase or capacitor-start-only motor falls short.
Common configuration: 1/3 HP to 2 HP, single-phase 115/208-230V dual voltage (usable at 208V), 48/56/56C/56H NEMA frame sizes, 1,725 or 3,450 nameplate RPM, open drip proof (ODP) or totally enclosed fan-cooled (TEFC) enclosure, rigid base or C-face/rigid base mounting, Class B insulation, and continuous duty rating with service factor typically 1.00 to 1.35.
Stop second-guessing. Match your use case below — then let ChatMRO's AI surface the exact Dayton SKU, electrical data, and alternatives in one natural-language search.
Lighter-duty pumps, small compressors, and general equipment needing better torque than split-phase. 1/3–1/2 HP models dominate here.
Equipment requiring strong starting torque plus efficient continuous running. 3/4–1 HP models dominate here.
Equipment requiring direct face-mounting to a gearbox, speed reducer, or pump housing.
Dayton (Grainger's private-label industrial brand) offers a broad lineup of capacitor-start/run general purpose motors spanning fractional to 2 HP, across multiple frame sizes and mounting styles. Here's how to navigate their catalogue without a 40-tab browser session.
ChatMRO indexes the full Dayton capacitor-start/run motor catalogue. Search any product by description, application, or rough spec.
The general pump/equipment workhorse. 115/208-230V dual voltage, 48 or 56 frame, 1,725 RPM, rigid base mounting. Open Drip Proof enclosure, 1.25-1.35 service factor, auto thermal protection on select models.
Search 103808/926557 Series →56 or 56H frame, 1,725 nameplate RPM, includes matched start/run capacitor set. NEMA Premium Efficient options, Open Drip Proof enclosure, continuous duty, Class B insulation.
Search 119157/917739 Series →56C frame with NEMA C-face mounting for direct attachment to speed reducers, pumps, blowers, or conveyors. Available in Open Drip Proof or Totally Enclosed Fan-Cooled enclosure, usable at 208V.
Search 56C Series →Use this table as a decision shortcut. Ask ChatMRO for the exact part once you know which row fits your spec.
| Model Class | HP | Frame | Best For | Full Load Amps | Enclosure | ChatMRO Verdict |
|---|---|---|---|---|---|---|
| Dayton 103808 | 1/2 | 48 | Fractional-HP pumps and general equipment | 4.6/2.4-2.3A | Open Drip Proof | Best entry point for smaller equipment needing dual-capacitor torque |
| Dayton 926557-2 | 1/2 | 56 | General purpose pumps, standard rigid base install | 4.6/2.4-2.3A | Open Drip Proof | Good alternative when 56 frame footprint is required over 48 |
| Dayton 30PT69/915153-4 | 3/4 | 56 | Pumps, compressors, blowers needing standard torque | 7.0/3.5A | Open Drip Proof | Most common choice for standard 3/4 HP replacement work |
| Dayton 917739 (56H) | 1 | 56H | Pumps/equipment requiring 56H mounting hole pattern | 8.4/4.6-4.2A | Open Drip Proof | Go-to when replacing a motor with the 56H 3"x5" hole pattern |
| Dayton 119179 | 2 | 56C | C-face mounted equipment, gearboxes, higher HP needs | 17.6/9.5-8.8A | Open Drip Proof | Use for higher-HP C-face applications like speed reducers |
| Dayton 56C TEFC Variant | 1/3–1 | 56C | Dusty, dirty nonhazardous environments with C-face mount | Model-specific | Totally Enclosed Fan-Cooled | Best when environment requires a sealed enclosure over ODP |
Not sure which row is yours? Describe your application to ChatMRO and get an instant AI-matched recommendation with datasheets.
Traditional catalogues force you to know the exact MPN before you find anything. ChatMRO flips that: describe what you need in plain English, and the AI finds the right motor from 30M+ indexed parts.
In plain language — by HP, frame size, or equipment being replaced. No MPN required.
Natural language processing maps your description to the closest-fit products across brands and specs.
Cross-brand equivalents, lower-cost substitutes, and in-stock alternatives shown side-by-side.
Add to cart or request RFQ directly from the results. No phone calls. No email chains.
Try these capacitor-start/run motor search examples
Whether you're a technician replacing a failed pump motor, or a facilities manager standardizing spares across multiple equipment units — use this framework before you procure.
NEMA frame designations (48, 56, 56C, 56H) determine shaft diameter, mounting hole pattern, and face-mount capability — confirm your existing frame size and mounting style before ordering a replacement.
Capacitor-start/run motors provide both strong starting torque and efficient continuous running torque, making them well suited to pumps and compressors — confirm this matches or improves upon your original motor's design.
Rigid base mounting suits standard bolt-down installations; C-face mounting is required for direct attachment to gearboxes, speed reducers, or pump housings that mate to a NEMA C-face.
Most models in this class are dual voltage 115/208-230V and usable at 208V — confirm this covers your specific electrical service before ordering.
Open Drip Proof suits dry to moderately humid indoor environments with good airflow cooling; Totally Enclosed Fan-Cooled suits dusty, dirty, nonhazardous environments needing a sealed enclosure.
Two motors with the same HP rating can have different frame sizes and mounting styles (rigid base vs. C-face). Search by function on ChatMRO — the AI surfaces exact matches AND available substitutes that fit your existing mounting.
Some models include matched start and run capacitors while others require separate capacitor sourcing — confirm what's included before ordering to avoid an incomplete replacement.
ODP enclosures are not designed for heavy dust or debris exposure — a TEFC enclosure is more appropriate in those conditions, and is available on many models in this class.
Describing your application to ChatMRO takes 30 seconds. The AI reads the full Dayton capacitor-start/run motor catalogue so you don't have to.
Just describe what you need. ChatMRO finds the right Dayton capacitor-start/run motor in seconds.
Dayton capacitor-start/run general purpose motors are among the most widely specified motor types for pumps, compressors, blowers, and conveyor equipment requiring both strong starting torque and efficient continuous running performance. The Dayton brand commands significant market presence due to its broad HP and frame size lineup spanning 1/3 HP to 2 HP, dual-voltage 115/208-230V compatibility, and mounting flexibility across rigid base and NEMA C-face configurations. Procurement professionals and facilities engineers in India, Southeast Asia, and North America regularly source Dayton capacitor-start/run motors for pump replacement, compressor maintenance, and general OEM equipment builds.
ChatMRO simplifies this procurement process by providing AI-powered natural language search across a catalogue of 30 million+ indexed industrial parts. Engineers and buyers no longer need to memorize MPN codes or navigate multi-level filter trees to find the right motor. A simple description of the HP, frame size, or equipment being replaced is sufficient to surface the correct Dayton product alongside cross-brand alternatives and real-time pricing.
