Does it drop into the existing panel footprint?
The MJN2CE-DC24 is an Omron MJN Series enclosed power relay in DPDT (2-pole, double-throw) configuration with a 20 A contact rating. The coil runs on 24V DC, matching the standard 24V DC control rail common to most retrofit cabinets without needing a step-down supply. It mounts side-flange on a surface plate with 8-pin tab terminations — the same mechanical envelope the MJN Series has shipped in for years, so a like-for-like swap into an existing cutout is the realistic path. No board re-spin, no DIN-rail geometry change.
What the 20 A contact rating actually switches
The 20 A contact rating applies on both AC and DC legs — 20 A at 277V AC and 20 A at 28V DC — which covers branch-circuit loads on a 277V lighting panel and 24V/28V DC battery or solenoid circuits in the same device. Dielectric strength is rated 2,500V AC between contacts and coil, 750V AC between contacts. It is motor-rated at 3/4 hp on 120V AC and 1-1/2 hp on 240V AC — so a fractional-horsepower fan, pump, or compressor starter coil can land on these contacts without an interposing relay. Electrical operating durability is 100,000 cycles; mechanical durability is 10,000,000 cycles, meaning the contact wear envelope, not the mechanism, is the life-limiting factor in high-cycle motor applications.
Where the MJN Series sits in the lifecycle curve
The MJN Series is listed at the mature stage, so the part is still on Omron's catalog but has been positioned as a long-running staple rather than a new introduction. Mature status typically means the footprint, datasheet, and replacement tooling are stable — useful when a retrofit needs the same pin pattern five years from now.