Panel fit and clearance
The 3RT2025-1BB40-1AA0: The envelope is 45 mm wide, 85 mm high, and 107 mm deep — that's the S0 footprint, which fits alongside other S0 accessories on the same rail. These spacings ensure adequate arc quenching and heat dissipation — don't crowd it against the enclosure wall or adjacent devices.
Switching performance and wire termination
Rated for 1,000 operating cycles per hour under AC-1, AC-2, and AC-3 duty, and 300 cycles per hour under AC-4. The arcing time is 10 ms; the DC dropout time (coil de-energization to contact opening) is 15 to 18 ms — useful for timing interlock sequences. The auxiliary switch is built in — no separate add-on needed for basic status feedback.
Environmental limits and storage
The coil pickup voltage is 0.8 x rated (19.2 V DC) and the dropout is 1.1 x rated (26.4 V DC) — so a sagging 24 V bus below about 19 V will drop the contactor out.