1300 N holding force and the safety circuit logic
The D4SL-N4QDA-D locks a machine guard closed until the PLC or safety controller explicitly de-energizes the solenoid — a mechanical lock that holds 1300 N and only releases when the coil is energized. This is failsafe by design: loss of 24 VDC keeps the guard locked, so a wiring fault or power loss does not open the safety circuit on its own. The 6-contact array (3 NC + 2 NC/1 NO) routes the lock status and guard position to separate safety channels so a single contact failure cannot defeat the monitoring function.
24 VDC coil, indicator, and wiring fit
Both the solenoid coil and the indicator lamp run at 24 VDC, so a single 24 V field supply powers the entire switch — no step-down or isolated bus needed. The terminal block connection accepts field wiring directly without a mating connector, which simplifies panel wiring on a DIN rail or subpanel but means conductor sizing and torque specs must match the terminal spec to maintain the IP rating of the assembly.
M20 conduit entry and metal head for industrial enclosure fit
The M20 conduit thread is the standard gland size for industrial enclosures in process and packaging automation — the matching gland clamps an armored or jacketed cable and seals the entry point. The metal head and standard metal release key suit panel environments where a plastic head would be a consumable failure point — repeated guard cycling in a high-cycle line chews plastic actuating heads faster than metal.