What the MY4H24DC actually switches
Au + Ag alloy contact material keeps the low-level signal path stable when the relay carries dry-circuit or analog-loop loads alongside its rated 330 VA switching capacity at 250 VAC or 125 VDC.
Socket-mount envelope and panel fit
At 21.5 mm wide × 36 mm tall × 28 mm deep the MY4H24DC drops into the standard MY-series octal/11-pin socket pattern, so existing panel layouts built around the series accept it without drilling or DIN-rail rework. Socket-mount via plug-in terminal means the coil and contact wiring land on the base socket while the relay itself remains field-replaceable — pull the relay, swap, re-seat; the wiring never has to come off.
Coil and contact ratings — the decision numbers
The 24 VDC coil matches the standard PLC output and 24 V control-rail bus directly, so the relay can be driven from a transistor output without an interposing relay or a separate power supply. The 3 A switching current at 250 VAC is the headline limit for AC inductive loads; the same 3 A holds at 125 VDC on the DC side, with the 330 VA figure governing low-power AC switching where the load is resistive or lightly inductive. Derate for any motor or solenoid duty — the 3 A rating is general-purpose, not motor-rated, and that distinction is what protects the Au + Ag contact set from premature welding under inrush.