Pushbuttons & Pilot Devices

Operator devices are sold as separate pieces, so a working replacement often means matching the operator, the contact block and the mounting size together.

Mounting hole size

Industrial operators are made for a small set of panel holes, most commonly 22.5 mm (sold as 22 mm), 30.5 mm (sold as 30 mm) and 16 mm. A 22 mm operator will not fit a 30 mm hole without an adapter, so confirm the hole size before you choose the brand.

Operator, contacts and lamp

A pushbutton is usually an operator (the button) plus a contact block with normally open and normally closed contacts, and on illuminated types a lamp or LED module with its own voltage. Momentary or maintained action, flush, extended or mushroom head, and the colour all matter; emergency stop heads are red mushrooms with a twist or pull release.

Limit switches

A limit switch is chosen by its body style, its head or actuator (roller lever, plunger, whisker or rod), its contact arrangement and its enclosure rating. The same body with a different head is a different part, so match the actuator and the direction in which the machine will operate it.

What to have ready

• The catalog number, and any number on the operator or the contact block
• The panel mounting hole size
• Momentary or maintained, head style and colour
• Contact arrangement: how many normally open and normally closed
• Lamp voltage, or for limit switches the actuator type and enclosure rating

Related guides and tools

• Tool: Obsolete Part Lookup

Not sure which one you have? Send us the number, a nameplate photo or the dimensions and the order desk replies within 1 business day.