Square D 8501XO40V02 Nema Control Relay Brand: Square D. Part Number: 8501XO40V02. Square D NEMA Control Relay, Type X, Series: 8501, 5/10 A, 50/60 Hz, 110/120 V AC Coil, 4NO 4 Form A, 10 A at 600 VAC Contact, 4 Pole, Panel Mount, Screw Clamp Terminal, -40 to 160 deg F, 2.23 in W x 3.95 in D x 3.5 in H. Additional Description: SQD -8501XO40V02 RELAY 600VAC 10AMP NEMA +OPTIONS. Catalog Description: NEMA Control Relay, Type X, machine tool, 10A resistive at 600 VAC, 4 normally open contacts, 110/120 VAC 50/60 Hz coil..