MSD Rotary Wafer Switch General Specifications: • Maximum Operating Voltage: 250 VAC • Contact Rating with Resistive / Non-Inductive Load: 6 Amps @ 250 VAC (rms) 10 Amps @ 30 VDC • Test Voltage: 2000 VDC for 1 minute • Insulation resistance: Greater than 105 megohms (between adjacent contact or contact and frame) • Contact resistance (initial): Less than 5 milliohms at 2.5 Vdc 1 amp • Contact life: A minimum of 5000 cycles at current and Voltage Ratings The MSD is essentially a heavy duty rotary switch having a power rating of 6 amps at 250 Vac, designed to handle higher currents than are possible with normal types of blade clip wafer switches. It is eminently suitable for use in a wide variety of electronic and household equipment. Developed by NSF Technical Service to incorporate modern materials and techniques that give the switch very long life at its full current rating. 1 Post 2 to 12 ways 2 Post 2 to 6 ways 3 Post 2 to 4 ways 4 Post 2 or 3 ways Maximum switching by index mechanism Wafer: The 'U' type mechanism is used when one or two wafers are required, the type 'HD' for switches with two or three. For more than three wafers, consult our Technical Service. Low friction molded cam and followers in the "U" type assembly ensure a smooth, positive indexing action. Balanced compression springs provide consistent and easily reproducible torque values ​​that can be approximated as: Light: Not greater than 0.18 Nm (25 oz Ins) Medium: Greater than 0.14 Nm (20 oz Ins) but less than 0.32 Nm (45 oz Ins) Heavy - Contacts greater than 0.28 Nm (40 oz. Ins): Copper, Silver Plated Rotor Contacts: Break-before-make only Terminals: Solder Lug Insulation: Stator - Diallyl Fiber Dialysate Phthalate (DAP) - Glass-Filled Nylon Finish: Standard Ferrous Parts Zinc Plated, Non-Ferrous Parts Clean Fitting Details: Imperial (Standard) Metric (Alternate) Bush 3/8" x 32 TPI (Pifalo) M10 x 0.75 Shaft 0.25" Bore 6mm Bore Nut 0.525" A/F 14 mm A / F The alternative is optional in each case. Unless otherwise specified, each switch is supplied with a wavey lock washer. Panel and spindle seals can be fitted allowing sealing at 1 cm³/hour Standard Contacts: Each wafer comprises two stators interconnected by a rotor. One to six multi-position contacts are installed on one stator, while the other has up to 12 single contacts. The rotor is equipped with up to 4 contacts to give the required number of poles and shapes.