Is MJN2CK-AC24 still the right relay for the BOM line?
The Omron MJN2CK-AC24 sits in the MJN Series as an enclosed, socket-mounted general-purpose relay with a DPDT contact arrangement and a 9-pin pin-termination footprint that mates with the C-coded socket. The 24V AC coil at nominal 60 Hz drops straight into a standard control-circuit supply without an interposing relay. The headline 10 A contact rating applies on both AC and DC switching paths — 10 A at 240V AC and 10 A at 28V DC — which keeps a single relay in the line whether the load is a solenoid, a heater bank, or a small DC pilot load. Motor-rated contact capacity is confirmed, with 1/3 hp at 120V AC and 1/2 hp at 240V AC, so it can switch fractional-horsepower induction loads directly without a downstream contactor.
What the dielectric and durability numbers mean on the bench
Dielectric strength is rated above 2,500V AC RMS at 60 Hz between mutually insulated elements and above 750V AC RMS across the open contacts, which is the figure that lets the relay sit on the same panel as higher-voltage circuits without a separate clearance barrier. Electrical operating durability is listed at 100,000 cycles; mechanical durability is 10,000,000 cycles, so the contact wear — not the mechanism — is what limits field service life on a frequently-cycled line. A manual push-test button is integrated into the relay, which is the field-service convenience that lets a technician exercise the contacts with a finger before re-energising the panel — useful when the relay sits inside a control cabinet without a hand-off-auto station.
Mature line, no successor on record — how to source it
The MJN2CK-AC24 is recorded as a mature product in the MJN Series, with no factory successor cited on the line card. That posture favours quoted-to-order sourcing against the BOM rather than spot stock — lead time and current price are confirmed at RFQ rather than carried as standing inventory.