Choosing an Electrical Switch
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Contact Blocks for Manual Switches
Make or break an electrical circuit. These contact blocks mount to manual switches and transmit an electrical signal when the switch actuator is engaged. You can stack multiple blocks, so a single switch can control several circuits. This is helpful in setups that require multiple systems to turn on or off at the same time. For example, the switch on a conveyor line could turn off the conveyor and turn on a diverter and alarm.
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals | Industry Designation | Wire Connection Type | Environmental Rating | For Switch Manufacturer Series | Each | |
Eaton | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | Screw Terminals | IP20 | M22 | 0000000 | 000000 |
| 1 | 1 On (Normally Closed) | 2 | SPST-NC | Screw Terminals | IP20 | M22 | 0000000 | 00000 |
Sprecher & Schuh | ||||||||
| 3 | 2 Off (Normally Open) and 1 On (Normally Closed) | 6 | 3PST-2NO/1NC | Screw Terminals | IP20 | D7P | 0000000 | 00000 |
22 mm Panel-Mount Knob Switches
Set these switches to either spring back (momentary) or stay switched (maintained). They're rated NEMA 4X, 13, and IP66.
Replace contact blocks (sold separately) or add additional contact blocks to control more circuits.
| No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Dia. | Dp. Behind Panel | For Max. No. of Contact Blocks | Environmental Rating | Specifications Met | Each | |
With Screw Terminals | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3 Position | |||||||||||||
| 3 | 2 Off (Normally Open) and 1 On (Normally Closed) | Springs Back (Momentary), Stays Switched (Maintained) | 6 | 3PST-2NO/1NC | 6 A @ 120 V AC, 3 A @ 24 V DC | 250V DC 500V AC | 13/16" | 1 3/4" | 6 | NEMA 4X, NEMA 13, IP66 | UL Listed, CSA Certified, CE Marked, CCC Marked | 0000000 | 000000 |
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals | Industry Designation | Environmental Rating | Specifications Met | Each | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | IP20 | UL Listed, UL 508, CSA Certified, CE Marked | 0000000 | 000000 |
| 1 | 1 On (Normally Closed) | 2 | SPST-NC | IP20 | UL Listed, UL 508, CSA Certified, CE Marked | 0000000 | 00000 |
Safety Relays
Receive signals from safety monitoring relays or controllers to switch devices off and on because of a system failure. Also known as force-guided or mechanically linked contacts, the interlocking opposing contacts on these relays cannot be open or closed at the same time. To keep your system from receiving false switching signals, the interlocking opposing contact must remain open even if a contact welds closed.
IP20 rated, they have recessed terminals that prevent fingers and other objects from touching live circuits. These relays have been tested to safety standards that can help you achieve your system's PL (performance level) and SIL (safety integrity level). Choose a relay with a PL and SIL rating to meet the needs of your system. Higher ratings indicate greater safety protection. As your system becomes more complex, you generally require a higher safety protection level. Mount them to 35mm DIN rail (also known as DIN 3 Rail).
Relays that meet SIL2 are tested for applications with a probability of failure of 0.1% to 1%. They’re often used for emergency shutdowns, and fire, gas, and overpressure detection.
| Number of Terminals | Input Voltage | Control Current, mA | Switching Current @ Voltage | Max. Switching Voltage | Ht. | Wd. | Dp. | Features | Each | |
With Screw Terminals—DIN-Rail Mount | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
3 Circuits Controlled with 2 Off (Normally Open) and 1 On (Normally Closed)—3PST-2NO/1NC | ||||||||||
| 8 | 24V DC | 26 | 10 A @ 240 V AC | 250V AC | 3.5" | 0.7" | 2.4" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |