Product Overview
Potter & Brumfield R10 Series 4PDT Relay, 115VAC Coil, 7.5A Contacts, in a Clear Plastic Case
Condition
New old stock. The relay photographed here is bright and unused: the copper coil bobbin is clean, the armature and its return spring are silver and untarnished, and the gold-colored contact assemblies show no arc pitting or blackening through the clear cover. The case is printed R10-E1W4-115V and 115VAC on one face, with a contact schematic, CSA and UL Recognized (RU) marks, a 7.5A line and a 120VAC RES rating line, and MEXICO. Part of that rating line is obscured by the terminal comb at this camera angle, so read it off the part in hand before you spec it. The blade terminals are straight and evenly spaced, and a captive screw sits in its boss at the top of the case. The last photo shows the Potter & Brumfield Control Components carton the photographed relay came in; it was taken out of its box for the camera. The photos are the spec for the piece photographed.
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Product Overview
The Potter & Brumfield R10-E1W4-115V is a general purpose electromechanical relay from the long-running R10 series, built with a four pole double throw contact set, a 115VAC coil, and a 7.5A contact rating. It is the kind of relay that sat in machine tool panels, elevator controls, test racks and process cabinets for decades, doing straightforward interposing and multi-circuit switching work. The clear plastic dust cover is the part's most useful feature on a live panel: you can see the armature pull in and watch the contact set wipe without pulling the relay out of circuit, and the contact schematic is printed right on the case so you are not hunting for a datasheet at two in the morning. Flat blade terminals run in staggered rows out the bottom for socket or quick-connect wiring, two spade tabs and a captive mounting screw sit at the top, and an axial component with a black body is visible alongside the coil with a diode-style symbol shown at the coil terminals on the printed schematic. This is a Potter & Brumfield part, photographed alongside a brand carton, not a relabel.
Key Features
- Manufacturer part number: R10-E1W4-115V, printed on the case
- Contact arrangement: 4PDT, four pole double throw
- Coil: 115VAC, marked 115VAC on the case
- Contact rating: 7.5A, with a 120VAC RES line printed on the case
- Series: Potter & Brumfield R10 general purpose relay family
- Enclosure: clear plastic dust cover with the contact schematic printed on it
- Terminals: flat blade terminals in staggered rows, plus two spade tabs and a captive screw at the top of the case
- Agency marks visible on the case: CSA and UL Recognized (RU)
- Country of origin printed on the case: MEXICO
- Coil suppression: not confirmed - a diode-style symbol appears on the printed schematic, verify against the datasheet before use
Applications
- A maintenance electrician keeping a 1980s machine tool panel running, matching the original 4PDT relay instead of redesigning the interposing logic around a modern 2-pole part
- A controls technician who needs four isolated changeover contacts off a single 115VAC coil to fan one command out to a starter, a lamp, a PLC input and an interlock string
- An elevator or conveyor service tech replacing a relay that has been cycling for thirty years, where the clear case makes an in-place visual check part of the routine
- A test rack builder who wants a socketable, schematic-on-the-cover relay so the next person to open the enclosure can read the contact arrangement without paperwork
Frequently Asked Questions
What does 4PDT actually give me here?
Four independent pole sets, each with a normally open and a normally closed contact, all driven together by the one 115VAC coil. That is four separate circuits you can switch or transfer from a single command, which is why these turn up as interposing relays where one signal has to do several jobs at once.
Is the 7.5A rating good for my load?
The case prints 7.5A along with a 120VAC RES line, and RES means resistive. Inductive loads, motors, transformers and lamp inrush all derate a contact set, and part of that printed rating line is hidden behind the terminal comb in these photos. Check the figure on the relay in your hand against the Potter & Brumfield R10 datasheet before you commit it to a load near the limit.
Has this relay been electrically tested?
No. It is sold as new old stock on the strength of its condition and its markings, not on a bench report. Coil resistance and contact continuity are a two-minute check with a meter before you wire it in, and worth doing on any part that has been on a shelf this long.
Does it plug into a socket or wire directly?
The bottom terminals are flat blades in staggered rows, which suits both a matching R10 socket and direct quick-connect wiring. The captive screw and spade tabs at the top of the case are the hold-down and mounting provisions. Confirm the socket footprint against the R10 series drawing for your panel, since the R10 family covers more than one terminal layout.
Why buy the two or three I need here instead of a forced lot of ten?
Because a panel repair rarely needs ten relays. We have nine of these on the shelf and you take the count your job calls for: one to get a machine back on line tonight, three or four to refresh a rack of interposing relays, without a minimum order or a bag of spares you will never open. The relay in these photos is representative of the nine on the shelf, and the photos are the spec for the piece shown. Shipping is $8 flat rate and free once your order passes $28, with orders leaving our Idaho warehouse the same or next business day.
Potter & Brumfield gave this one a clear cover so a tired electrician could see the armature pull in without dropping the panel door, and printed the schematic on the case so nobody had to go looking for it. Wire it in, watch it snap over, and let it start another thirty years on your machine.
