What the 48/60 V coil means in practice
The B6-30-10-03: The 48/60 V coil rating means the contactor pulls in reliably on a nominal 48 VAC or 60 VAC control supply — common in older industrial installations or legacy panel designs that use a 48 V control transformer. The pickup voltage is typically around 85% of nominal, so a 48 V coil will hold in above roughly 40 V; dropout occurs below about 18 V. If your control circuit is 24 VDC or 120 VAC, this coil will not work without a transformer change.
Panel fit and wiring note
The three main poles handle the load circuit; auxiliary contact blocks can be added to the front or side slots for feedback or interlocking. Spring-cage or screw terminals accept 0.2–2.5 mm² conductors — strip length around 8 mm for the cage type.