- Lids
- Bottoms
- Compactor Parts
- Commercial Dumpster Parts
- Roll-Off Container Parts
- Refuse Body Truck/Roll-off Hoist Parts
- Lids
- Bottoms
- Compactor Parts
- Commercial Dumpster Parts
- Roll-Off Container Parts
- Refuse Body Truck/Roll-off Hoist Parts
- Lids
- Bottoms
-
Compactor Parts
Power UnitsElectrical PartsLimit/Safety/Photo/Press. SwitchesButtons/Switches/Keys/LegendsHydraulic PartsCylindersOther Compactor Parts30 MMPanels And ControlsMotorsMotor Starters / Transformers / FusesAccessories Electrical30 MM Key Switch30 MM Selector Switch30 MM Push Only Switch30 MM Legends30 MM Contacts And Replacement Keys22.5 MM
- Commercial Dumpster Parts
- Roll-Off Container Parts
-
Refuse Body Truck/Roll-off Hoist Parts
Heil Replacement PartsMcNeilus Replacement PartsTarp Systems & PartsRoll-Off Hoist/Hook Hoist PartsRoll-off / Hook Hoist PartsCurrotto Can Replacement PartsCables & StrapsRollers & AccessoriesSheave Pulleys & PinsHoist CylindersContainer Securement System & PartsRoll Off Hydraulics,Filters,& PneumaticsRoll-Off ElectricalCurotto Can Replacement CylindersCurotto Can Body Replacement PartsCurotto Can Grabber Beam PartsCurotto Can Slide Assembly PartsCurotto Can Hydraulics & PneumaticsOther Manufacturer Replacement Parts
AB START ELEMENT AUX CONTACT NO
POWER UNIT, PLC 3 PH 10 HP 12 GPM W/15' CNTRLS
Part # : A.PUX.LC.3.10
4/36/2.5R/31.25 COMPACTOR CYL. (BY PASS)
Part # : C.CYL.436.BP
5/50/2.5R/42 COMPACT. CYL (BY-PASS)
Part # : C.CYL.550.BP
AB 30MM CYLINDER LOCK PUSH BUTTON (KEY SWITCH) WITH GUARDED BEZEL WITH 2 NO
Part # : C.AB30.NX970
1.25" PIN FOR COMP. CYL - UNIVERSAL ADJ. (with COLLAR, SCREW & NUT)
Part # : C.CYL.PIN.9
NEMA Motor Starters for Industrial Compactors
NEMA motor starters for industrial trash compactors — Sizes 1, 2, 3, and 4 with integrated thermal overload protection. The historical North American industrial standard, used on most pre-2010 commercial compactors. Drop-in replacements for Marathon, PTR, Wastequip, Harmony, and SP Industries.
What this page covers
NEMA motor starters are sized by category (1, 2, 3, 4), with each size covering a defined range of motor horsepower at standard voltages. Size 1 handles up to 7.5HP at 480V or 5HP at 240V. Size 2 handles 25HP at 480V or 10HP at 240V. Size 3 handles 50HP at 480V or 25HP at 240V. Size 4 covers heavy industrial above that.
Most stationary commercial compactors use Size 2 starters (driving 10HP motors at 480V or 7.5HP at 230V). Self-contained and heavy-duty applications use Size 3. PRT stocks all sizes with the standard 120V AC control coil and Class 10 or Class 20 thermal overload relays.
How to choose
Match by NEMA size (1, 2, 3, 4), control coil voltage (typically 120V AC for compactor service), and thermal overload class (Class 10 for standard motors, Class 20 for high-inertia applications).
If you're replacing a like-for-like starter, the existing one's NEMA size is usually printed on its housing. If you're sizing a new starter from scratch, the NEMA size chart matches motor HP to size — PRT customer service can confirm.
NEMA starter sizes and applications
- NEMA Size 1Up to 7.5HP at 480V or 5HP at 240V — small stationary compactors.
- NEMA Size 2Up to 25HP at 480V or 10HP at 240V — most common compactor size.
- NEMA Size 3Up to 50HP at 480V or 25HP at 240V — self-contained and heavy-duty.
- NEMA Size 4Heavy industrial above 50HP.
- Combination startersStarter + disconnect + fuses in one enclosure.
- Class 10 overloadStandard thermal overload for normal-inertia compactor motors.
- Class 20 overloadHigher trip time for high-inertia or hot-start applications.
Frequently asked questions
How do I size a NEMA starter for my compactor motor?
Match the starter size to the motor's HP at the building's voltage. NEMA Size 1 = 7.5HP at 480V; Size 2 = 25HP at 480V; Size 3 = 50HP at 480V. Most stationary commercial compactor motors (10HP at 480V) need a Size 2 starter.
Are NEMA starters interchangeable across brands (Square D, Allen Bradley, Eaton)?
Functionally yes — they all meet the same NEMA size rating. Mounting patterns and terminal layouts may differ slightly; check the existing starter's mounting before ordering.
Can I replace a NEMA starter with an IEC starter?
Functionally yes, but it requires rewiring — the terminal layout is different, and the overload relay format isn't interchangeable. Most operators stay with the format their original equipment uses.
What's the difference between Class 10 and Class 20 overload?
Trip time. Class 10 trips faster (typical for standard motors with normal startup); Class 20 takes longer to trip (for high-inertia loads or hot-start conditions). Most compactor service uses Class 10.