SPST Switches | McMaster-Carr

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101 Products

Switches

Mil. Spec. Washdown Toggle Switches

These switches meet MIL-S-3950.

DIN-Rail Mount Miniature Toggle Switches

Built into a terminal block, these switches mount to DIN rail.

Photoelectric Switches with Relay Output

A built-in relay produces AC voltage output. These switches are often used with older programmable logic controllers (PLCs).

Time-Delay Photoelectric
Switches with Relay Output

Set these switches to delay activation by up to five seconds after detecting an object.

High-Current Time and Day Activated Switches

Control equipment with high currents, such as landscape lighting, pumps, and heaters.

Outdoor High-Current Time
and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing.

Outlet-Box-Mount Time and Day Activated Switches

Switches fit single device (1 gang) outlet boxes.

Outdoor Set-to-the-Minute High-Current
Time and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing.

Set-to-the-Minute High-Current
Time and Day Activated Switches

For precise control of high-current equipment such as landscape lighting, pumps, and heaters, these switches schedule on/off times to the exact minute.

Flow Switches

Fixed-Setpoint Flow Switches for Drinking Water

Factory set to activate equipment when your drinking water system reaches a fixed level, these flow switches are easier to install than adjustable flow switches.

Fixed-Setpoint Flow Switches

Since they come factory set to a specific set point, these switches are easier to install than adjustable flow switches.

Fixed-Setpoint High-Pressure Flow Switches

Quicker to install than adjustable flow switches in high-pressure lines, these switches come factory-set to activate or deactivate equipment at a specific level. They compensate for the viscosity and density changes of liquid.

Electronic Flow Switches

When these switches reach a set flow rate, they send digital signals to your programmable logic controller (PLC) to activate automated controls or alarms.

Sanitary Electronic Insertion Flow Switches

Easy to clean and install, these flow switches are 3-A certified to meet sanitary design standards and insert into your line with a quick-clamp mounting adapter. They send digital signals to your programmable logic controller (PLC) to activate automated controls or alarms when they reach a set flow rate.

Electronic Insertion Flow Switches

Instead of disassembling your system for inline installation, thread these flow switches onto a mounting adapter and insert them into a pipe tee or pipe outlet. They send digital signals to your programmable logic controller (PLC) to activate automated controls or alarms when they reach a set flow rate.

Thermostats and Guards

Line-Voltage Thermostats

Regulate line-voltage HVAC systems.

Tamper-Resistant Line-Voltage Thermostats

A built-in guard prevents accidental changes and other tampering and protects these thermostats from damage. These thermostats regulate the temperature in HVAC systems that use direct electrical power.

Plug-In Line-Voltage Thermostats

Plug in the thermostat, then plug your heater into the socket on the thermostat's plug.

Programmable Line-Voltage Thermostats

Set these thermostats to adjust the temperature at certain times each day. They regulate heaters that use direct electrical power, such as baseboard and wall heaters.

Snap-Action Thermostats

Also known as snap discs, these thermostats switch on cooling systems or switch off heating systems when equipment gets too hot.

Enclosure Thermostats for Multiple Devices

Keep electronics in your enclosure from getting too hot or cold with these thermostats that control two devices at once.

Enclosure Thermostats

Control a single heating or cooling device in your enclosure to keep electronics at a safe operating temperature.