Datasheet

Sensing and Productivity Solutions 3

MICRO SWITCH™ Magnetically Held Toggle Switches, ET Series

PRINCIPLE OF OPERATION

A holding coil in ET toggle switches replaces mechanical holding

mechanisms to maintain the toggle in an operate position. The

toggle is released by breaking the coil circuit.

When the hold-in-coil circuit is open, the ET functions as a

momentary contact switch. When the coil is energized (through

remote contacts), the toggle lever will be held (maintained) in the

operate position. De-energizing the coil causes the lever to snap

back to the unoperated position. The lever can also be released

manually (overridden). The solenoid has a hold-in capacity only.

Energizing the coil circuit will not pull the toggle lever into an

operated position from an unoperated position.

(1) (2) (3)

Two-Position

The illustration above shows the operating sequence for an ET

with one SPDT circuit. (1) circuit closed manually; (2) energized

solenoid holds switch circuit closed; and (3) remote contact

breaks solenoid circuit, releases the toggle, and opens the switch

circuit. In ETs with two SPDT circuits, both circuits transfer when

the lever is operated.

Three-Position

ETs with two SPDT circuits have a magnetic hold-in capability in

both directions from center. When the lever is in the center posi-

tion, the circuitry is as shown in the illustration below. When the

lever is moved to one extreme position, switch (A) circuit is trans-

ferred and switch (B) circuit is unchanged. In the other extreme

position, switch (B) circuit is tranferred while switch (A) circuit is

unchanged.

TOGGLE TYPES

Standard — Tapered matte ﬁnish stainless steel.

Pull-to-unlock — Prevents accidental actuation; must be pulled

out to change positions. Stainless steel and nickel-plated brass.

Push-to-unlock — Guards against accidental operation. The

toggle must be depressed approximately .100 inch before it can

be moved to either extreme position. Matte-ﬁnish stainless steel.

Tab — Paddle-shaped clear anodized aluminum tab.

TERMINAL TYPES

Turret — Plated for easy solder connection of up to #14 wire.

Leadwire — No. 20 wire per MIL-W-5086, marked per

MIL-W-5088. Standard length of six feet. Leadwire ends are

stripped. Other material and lengths can be furnished.

Screw – 4-48 UNF x 0.188 (ref.) (long round head screws with

lockwashers). Separated by molded phenolic barriers.