Product Overview
Square D Class 9065 Type CO-1R Series A Overload Relay, Manual Reset, 25 A at 600 V
Condition
Listed New. The molded black plastic body shows no chips or cracks, though the edges carry light grey scuff marks and a similar rub mark crosses the face of the red reset lever - ordinary shelf and handling contact. The factory lettering is crisp and fully legible: CLASS 9065, TYPE CO-1R, SERIES A on one face, SQUARE D, MILW., WIS. below it, and the ratings block reading POWER CKT: 25 AMP, 600 V. AC OR DC and CONTROL CKT: 600 V. AC, 250 V. DC. The red reset lever with RESET molded into it is present and intact. Brass terminal screws and the copper current straps carry the mild darkening you expect from long shelf storage, and no wire crush marks, arcing or heat discoloration are visible in either photo. No separate thermal unit or heater element appears in the photographs, and the trip mechanism has not been exercised here. The relay was photographed in hand for scale against our bench mat; the photographed unit is representative of our stock, and the photos are the spec for that piece only.
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Product Overview
This is a Square D Class 9065 thermal overload relay, Type CO-1R, Series A - the manual-reset overload block that sat under the contactor in generations of Square D motor starters and motor control centers. The ratings molded into the body give the power circuit 25 amps at 600 volts AC or DC and the control circuit 600 volts AC, 250 volts DC. Construction is exactly what the era called for: a molded black body, heavy brass screw terminals over copper straps, and a red mechanical reset lever on one flank that a maintenance electrician could reach and push without opening a manual. The case carries SQUARE D, MILW., WIS. molded into it, the maker's mark as it reads on this body. If you are matching an existing overload block in a legacy starter, compare the class, type and series lettering in our photos against the unit you are replacing before you order.
Key Features
- Manufacturer marking: SQUARE D, MILW., WIS. molded into the body
- Class: 9065
- Type: CO-1R
- Series: A
- Power circuit rating, as molded: 25 AMP, 600 V AC or DC
- Control circuit rating, as molded: 600 V AC, 250 V DC
- Reset: manual, red lever with RESET molded into the face
- Terminals: brass screw terminals over copper current straps
- Body: molded black plastic housing
- Thermal unit / heater element: none shown in the photographs
Applications
- Plant electrician keeping an original Square D motor starter in service instead of replacing an entire bucket
- Panel shop rebuilding a legacy motor control center section where the modern replacement will not fit the existing mounting
- Machine restorer bringing an older production machine back to its documented Square D control layout
- Maintenance stores buyer holding a shelf spare for an obsolete starter that is no longer catalogued
Frequently Asked Questions
What exactly is printed on this relay?
Every marking quoted here is read directly off the photographs. One face carries CLASS 9065, TYPE CO-1R, SERIES A with SQUARE D, MILW., WIS. beneath it. The adjacent face carries RATINGS, POWER CKT: 25 AMP, 600 V. AC OR DC, CONTROL CKT: 600 V. AC, 250 V. DC. Nothing else is legible on the body, and we have not added anything the camera does not show.
Does a thermal unit or heater element come with it?
No thermal unit or heater element appears in either photograph, so plan on the relay body as shown and nothing more. Heater selection on a Square D overload block is keyed to your motor's nameplate full-load amps - not confirmed here, so check Square D's published selection data for the 9065 CO series against your motor before you order a heater.
Has the trip and reset mechanism been tested?
No. We have not exercised the reset lever, tripped the mechanism, or put current through it. The lever is present and the RESET lettering is molded into it, and that is as far as our observation goes. Bench check the relay before it protects anything that matters.
How do I know this matches the block already in my starter?
Compare the class, type and series lettering. Square D used CO-1R within Class 9065, and a Series A body will not necessarily interchange with a later series or a different type in the same class. Pull your existing block, read its face, and match it letter for letter against our photos - that comparison is more reliable than a catalog cross-reference on a starter this old.
I only need the overload block, not a whole starter. What am I taking on if I buy this one?
You are getting an overload block and nothing beyond it: the marked Class 9065 Type CO-1R Series A body with its brass terminals, copper straps and red manual reset lever, unmounted, with no heater and no test result behind it. We hold more than one, so the unit in these two photographs is representative rather than reserved, and the electrical check is yours to make on the bench before it goes into a live cabinet. This item clears the free-shipping line on its own, and orders leave our Idaho warehouse the same or next business day.
Square D was still stamping MILW., WIS. into these bodies when motor protection meant a steel cabinet and a red lever you could reach without a laptop. If you are keeping an original 9065 starter honest, this is the shape that fits your bucket.
