Product Overview
PM-17DY-24 Open-Frame Chassis Mount Power Relay - 4PDT, 24VDC Coil, #8-32 Screw Terminals
Condition
Single unit available. Unused, new old stock recovered from a legacy electronics supply chain. Original packaging is not included; instructions and paperwork are not included. Evaluation: visual inspection only. Function testing not performed. In the photographs the black side label reads "Potter & Brumfield PM-17DY-24 24VDC" with "9709 MADE IN MEXICO" below it, consistent with a late-1990s date code. The gold chromate mounting bracket is bright with only light discoloration, the keyhole mounting slot and forked feet are undamaged, and the copper coil winding visible from the side is clean and unbroken. All fourteen terminal screws and their clamp plates are present, straight, and free of visible corrosion; the clamp plates carry a light matte gray film. The insulated flexible leads running from each moving contact carrier to its terminal screw are intact, with no visible cracking, chafing, or discoloration of the insulation. The UL panel on the coil housing reads "1HP. 120/240 VOLTS A.C. 1PH", "25 AMP., 277 VOLTS AC MAX.", "10 AMP., 36 VOLTS DC RES." and "LIST 181G. IND. CONT. EQ." Those label figures are lower than the 35A and 20A ratings carried in this listing - verify the ratings against the Potter & Brumfield datasheet and against the label on the unit you receive before you design around them.
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Product Overview
The Potter & Brumfield PM-17DY-24 is a heavy-duty open-style power relay with a 4PDT (4 Form C) contact arrangement, built for polyphase and multi-circuit control work where a single- or double-pole relay will not cover the job. Nothing is sealed away: the photographs show the copper coil bobbin, the armature and its two return springs, the copper bus straps, and every contact carrier out in the open where a technician can inspect them, which is exactly why open-frame relays outlived their sealed contemporaries in serviceable panels. The unit mounts by a gold chromate bracket with a keyhole slot and forked feet, and terminates in fourteen #8-32 screw terminals sized for ring or fork lugs. Coil operates on 24VDC. The nameplate carries UL List 181G, the industrial control equipment listing, and the body is marked 9709 MADE IN MEXICO.
Key Features
- Model: PM-17DY-24, Potter & Brumfield
- Contact arrangement: 4PDT (4 Form C)
- Coil voltage: 24VDC
- Contact rating per this listing: 35A at 277VAC (resistive)
- Contact rating per this listing: 20A at 28VDC
- UL panel on this unit reads: 25A at 277VAC max, 10A at 36VDC resistive, 1HP at 120/240VAC single phase, LIST 181G IND. CONT. EQ. - confirm ratings before designing around them
- Terminals: fourteen #8-32 screw terminals with clamp plates, for ring or fork lugs
- Enclosure style: open-frame, non-sealed, chassis mount
- Mounting: gold chromate bracket with keyhole slot and forked feet
- Body marking: 9709, MADE IN MEXICO
- Contact material: silver cadmium oxide - Not confirmed - verify against datasheet before use
Applications
- Maintenance electrician rebuilding a legacy motor control panel who needs four poles switched from one 24VDC command
- Elevator technician keeping original relay logic in service rather than retrofitting a controller board
- Machine shop owner replacing a failed contactor in a heating element or resistive load circuit
- Restorer of vintage industrial equipment who wants an open-frame relay that can be inspected and cleaned instead of replaced
Frequently Asked Questions
Is this a 24VDC or 24VAC coil?
24VDC. The side label reads 24VDC and the photographs show the bare copper coil bobbin. Do not apply an AC control signal to this coil. An AC signal on a DC coil will cause chatter and coil burnout. Confirm your control system outputs DC before installation.
What contact ratings should I design to?
This listing carries 35A at 277VAC resistive and 20A at 28VDC. The UL panel photographed on this specific unit reads 25 AMP 277 VOLTS AC MAX and 10 AMP 36 VOLTS DC RES, along with 1HP at 120/240VAC single phase. Those two sets of figures do not agree, so treat the label on the unit as the governing number and cross-check the Potter & Brumfield datasheet before you specify it into a high-inductive load. Contact welding is the failure mode when a relay is run past its contact rating.
What do the markings on the relay actually say?
The black side label reads Potter & Brumfield, PM-17DY-24, 24VDC, with 9709 MADE IN MEXICO stamped alongside. The UL and CSA marks appear on the coil housing panel with LIST 181G IND. CONT. EQ. Photo five shows that panel straight on if you want to read it yourself before buying.
Does this include a socket or mounting base?
No. This is the relay only. No socket, mounting base, or accessories are included. The PM-17DY-24 wires directly to its screw terminals and mounts through the gold chromate bracket shown in photos three and four - no plug-in socket is required.
What terminal hardware does this use?
#8-32 screw terminals, fourteen of them, each with a clamp plate. Photo two shows them in four rows of four, four, four and two, which reads as twelve contact terminals for the four Form C poles plus two coil terminals - confirm the pinout against the Potter & Brumfield datasheet before you wire it. Ring or fork lugs are the standard termination for conductors at this current rating. Verify your lug sizing matches the conductor gauge before installation.
I only need one relay. Why buy a single piece here instead of a bulk lot elsewhere?
Because a panel repair needs one relay, not ten. PartsMine sells the exact quantity you need, one or two pieces for a repair or a prototype, instead of forcing a lot of 10 or 50 on you. Shipping is $8 flat rate and free over $28, and orders go out same or next business day from Idaho. For a single relay the total lands well under what a forced-quantity lot would cost you.
Open-frame relays never hid anything - the coil, the springs, and every contact sit right out in the daylight where a technician can watch the work happen. This 9709 Potter & Brumfield has waited since the late nineties for a panel that still thinks that is a virtue.
