Product Overview
Crydom PS-240 Power Supply Module - 240VAC Input, 20VAC 100mA Output, Screw and Quick-Connect Terminals
Condition
Single unit, unused NOS, sold untested. The photos show a squared black case with the Crydom name, the PS-240 part number and both terminal ratings molded into the top face in raised white lettering. Two Phillips screw terminals sit at the input end and two flat blade quick-connect tabs at the output end, all four on the same face, with white sealing compound visible where each terminal enters the case. The screw heads and blade tabs photograph bright. The case carries scattered light scuffs and the flat base plate shows dense fine scratching of the kind bins and shelves leave; we read those as storage marks, not service wear, and nothing out of the ordinary for shelf stock of this age. Evaluation was visual inspection only. The module has not been energized and no function test was performed. No documentation or mounting hardware is included.
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Product Overview
The Crydom PS-240 is a self-contained AC power supply module in a squared black case, with a mounting plate that extends past the body and carries a through hole on each of two opposite sides. Every rating quoted here is read straight off the part: the top face is marked CRYDOM POWER SUPPLY MODULE and PS-240, with 240VAC INPUT 100mA bracketed over the pair of screw terminals and 20VAC OUTPUT 100mA bracketed over the pair of flat blade quick-connect tabs. Both sides are AC, so this is a step down from a mains-class 240VAC feed to a low-voltage 20VAC output rather than a DC supply, and the two terminal styles are physically different, which means the high side and the low side cannot be landed on each other by accident. Crydom built its name on industrial solid state relays, and the PS-240 wears the same kind of squared black case, which is how a supply module ends up filed as a relay. It is not one: the part carries exactly four terminals, all on the top face, marked as an AC input pair and an AC output pair, with no control input among them. Frequency rating, regulation behavior, isolation class and internal construction are not marked on the case and were not tested here. Not confirmed - verify against the Crydom datasheet before use.
Key Features
- Input marked 240VAC, 100mA
- Output marked 20VAC, 100mA - an AC output, not a DC rail
- Two screw terminals on the input side, two flat blade quick-connect tabs on the output side, all on the same face
- Mounting plate extends past the case with a through hole on each of two opposite sides
- Case marked CRYDOM, POWER SUPPLY MODULE and PS-240 in raised white lettering
- White sealing compound visible where each terminal enters the case
- No control input among the four marked terminals - this is a supply module, not a solid state relay
- Frequency, regulation, isolation class and internal construction not marked - not confirmed, verify against the datasheet before use
Applications
- A maintenance tech holding a print that calls out a PS-240 by number and needing the same module rather than a redesign of the control feed
- A panel builder who needs a small 20VAC source off an existing 240VAC leg without adding a separate enclosure for a DIN-rail supply
- A bench or test-fixture build that wants a low-current AC secondary instead of a DC supply, brought up carefully behind a fuse
- A shop keeping spares on the shelf for Crydom-era industrial control hardware that is no longer easy to source
Frequently Asked Questions
Is this a solid state relay?
No. The case is marked CRYDOM POWER SUPPLY MODULE, PS-240, with an AC input rating and an AC output rating bracketed over its only two terminal pairs, and no control input among them. It shares the squared black case Crydom used across its industrial line, which is how it gets mistaken for a relay. We corrected this listing to the marking on the part.
How are the terminals arranged?
All four connection points are on the top face. The marking brackets 240VAC INPUT 100mA over the pair of Phillips screw terminals and 20VAC OUTPUT 100mA over the pair of flat blade quick-connect tabs, so the input lands under screw heads and the output takes standard push-on female disconnects. Treat the screw side as mains-class and wire it accordingly.
Why does the case read 100mA on both the input and the output?
Because that is what is molded into it, and we report markings as marked rather than reconciling them for you. A 240VAC to 20VAC step down would not normally pull the same current on both sides at full load, so the two figures are most likely independent maximum ratings rather than a matched pair. Not confirmed - verify against the Crydom datasheet before use.
What is included, and was it tested?
The module only. No documentation, no mounting hardware, no mating disconnects. Evaluation was visual inspection under the camera; it has not been energized, and output voltage, regulation and isolation are unverified.
Why buy an unused module that nobody has powered up?
Because you are buying a specific piece and you can see all of it before you decide. This is the exact module in the photos, unused NOS, shot from the marked top face, from the scratched base plate and from the terminal end at an angle, so the case markings and the physical condition are both on the table. What we will not do is tell you it works: it has not been energized, and the markings on the case are the entire documented spec. If you need a guaranteed-good, datasheet-backed supply, buy a current production part. If you need a legacy Crydom PS-240 and you are equipped to bring one up safely, this is that part with nothing hidden. Shipping on this one is free - it clears our $28 free-shipping threshold on its own - and orders leave our Idaho warehouse the same or next business day.
Crydom molded what this thing actually is into the top face in raised white letters, which did not stop our own paperwork from calling it a relay. If your panel needs 20VAC off a 240VAC leg, the case has been saying so all along - now it can say it on your bench.
