OTTO B3 Double Break Basic Switch Range Details

A reliable & compact Double Break Sub-Miniature Basic Switches, designed for tight spaces. The OTTO B3 Double Break Basic Switch provides low-level switching, with push button - Suitable to accept actuation directly from a cam. KEY FEATURES • Up to 8 amps Switching • Low Operating Forces • MIL-PRF-8805/76 & MIL-PRF-8805/101 OTTO B3 Double Break Sub-Miniature Switches offer both commercial & military grades, with a choice of two widths & a variety of terminal styles.


OTTO B3 Switches are reliable & compact double break sub-miniature switches, designed for tight spaces. Available in commercial & military grades, suitable for a variety of applications.

Providing low-level switching, with push button action the OTTO B3 Double Break Switch is ideal to accept actuation directly from a cam and features a range of custom options.


Low level switching capability
Less than 25mΩ contact resistance
Up to 8 amps switching capability
Button accepts actuation directly from a cam
Choice of 0.156” & 0.200” wide models
Choice of 6 standard terminal styles or wire leads
Available in Commercial & Military grades
Qualified to MIL-PRF-8805/76 & MIL-PRF-8805/101
UL recognized & CSA certified
RoHS/WEEE/Reach compliant


Circuitry: Sea Level @ 28VDC/70000 @ 28VDC/Sea Level @ 115VAC, 60/400Hz*
SPST-NO or NC Resistive: 8A/8A/8A
Form Z: 5A/5A/5A
Form C: 5A/5A/5A
Gold Contacts: 5A/5A/NA
SPST-NO or NC Inductive**: 5A/3A/5A
Form Z: 3A/2A/3A
Form C: 2.5A/1.5A/2.5A
Gold Contacts: 3A/2A/3A
*Applies to commercial grade switches **L/R = 0.026
Lamp: 1A/NA/1A
Motor: 5A/NA
DWV: 1000Vrms/400Vrms
Low Level:  Gold contacts 10mA @ 30mV
Electrical Life:  50,000 cycles at full load
Mechanical Life:  1,000,000 cycles
Seal:  Unsealed
Operating Temp Range:  -65°C to +125°C
Operating Force:  5 oz +3/-2 oz typical, 6 oz max, or 5 oz min options
Release Force:  1.5 oz min
Operate Point:  0.320 +/- 0.015 inches from mounting holes
Overtravel:  0.004 inches min
Movement Differential:  0.018 +/- 0.008 inches


Case:  Thermoset, blue
Cover:  Thermoplastic, blue
Button:  Thermoplastic, black
Terminals:  Brass with gold
Contacts:  Stationary: Silver with gold plate/Moveable: Silver with gold plate
Terminal Hardware:  None provided, optional wires
Mounting Hardware:  None provided