NSF Controls Limited Keighley West Yorkshire BD21 5EF
General Information
Characteristics.
Index Mechanism.
Contacts &
Termination’s.
Rotor Blades.
Insulation.
Finish.
Mounting Details.
Maximum Switching
Per Wafer
The Type MU mechanism provides indexing angles of 30°, 36°, 45° and 60°,
Light 7 to 18 x 10
High
Electrical, Maximum working voltage,
Contact rating, Current carrying
Current breaking with a resistive/nonreactive load.
Proof Voltage.
Insulation resistance.
Contact resistance (initial).
Mechanical.
End stop strength.
28 to 56 x 10
No. of Poles. 36° MUMA (b) 30° MUMA (a) 45° MUMA (c) 60° MUMA (d)
These versatile miniature switches have 25.4 mm diameter moulded wafers and are available in
2 versions, 36° indexing  having 18 clip positions and 30° indexing  having 22 such positions. 15°, 45°
and 60° indexing are variations of the latter.Optional features include concentric shafts, panel and
spindle seals, printed circuit termination’s and momentary contact models.
(see Bulletin RW36 for full technical details).
The low friction moulded cam followers in the assembly ensures a smooth indexing action.
Balance pressure springs provide consistent and readily reproducible total switch torque values
within the following ranges.
Type A indexing mechanism may also be used as an alternative where a simpler, space saving
mechanism is required. The switch then becomes model AMA. 30° indexing only.
Standard.
Alternatives.  Hard gold plated or silver contacts are available at extra cost as are contacts with
gold flash.
Termination’s.  Forward, standard: Straight, alternative.
Standard.
Alternative.
Stator.
Rotor.
Index Springs, Stainless steel: other metal parts, passivated zinc plated. Finishes to order.
Imperial (standard).
Bush 3/8” x 32TPI (Whit.)
Shaft 0.25” dia.
Nut 0.525” A/F.
1 Pole.
2 Pole.
3 Pole.
4 Pole.
5 Pole.
6 Pole.
7 Pole.
2
2
Nm(10 to 26 oz, ins,)
Nm (40 to 80 oz, ins,)
10 Positions.
2 to 10 ways
 Shorting. (make before break. MBB.)
 Nonshorting. (break before make. BBM.)


2 to 5 ways
2 to 4 ways
2 or 3 ways
Rotary Wafer Switches  Model MUMA



Temperature range.
Silver plated brass.
Moulded glass fibre loaded diallylphthalate (DAP)
Polycarbonate.
Engineering Bulletin No RW25
(+44(0) 1535 661144
2 to 12 ways
2 ways only
2 ways only
2 to 7 ways
2 to 5 ways
2 to 4 ways
2 to 3 ways
300Vdc/ac (rms).
2amp continuous.
150mA at 250Vac (rms)..
1000Vrms at sea level.
Not less than 500 megohms at 500Vdc.
(between any 2 parts requiring electrical insulation)
10 milliohms maximum at 100mV (rms). 100mA.max.
0,8 ± 0,1 Nm (114oz.in.)
Medium
positions 3, 5,
Metric (alternative)
M10 x 0.75.
6mm, dia.
14mm A/F.
(fixed stop at
and 7 ways)
2 to 8 ways
Fax: +44(0) 1535 661474
14 to 32 x 10
12 Positions.
2
Nm (20 to 46 oz, ins,)
2 ways only
2 to 6 ways
2 to 6 ways
2 or 3 ways
2 or 3 ways
40°C. to +100°C.
onoff

Email:
providing 1 pole
15° MUMG
switching.
2 wafers
24 way