Standard Relays
Standard relays are electromechanical relays with two or four changeover (CO) contacts, used with a socket in panel control circuits. They are used to obtain multiple independent contacts from one control signal, build latching (seal-in) circuits, and switch loads such as pilot lights, valves and contactor coils. In this category, Molwex relays with 2 CO 10 A and 4 CO 5 A contacts, LED indicator and test button are listed with coil voltages such as 12 V DC, 24 V DC, 110 V DC, 220 V DC, 24 V AC, 48 V AC, 115 V AC and 230 V AC. Select the coil voltage according to the voltage and type of the control circuit, the number of contacts according to the number of independent circuits you need, and the contact current according to the current of the load. Verify on the product page whether the socket must be ordered separately. A standard relay has mechanical contacts; for heater loads that switch on and off very frequently, it is not a substitute for a solid state relay (SSR).
Products
- Siemens LZS:RT3A4L24 Interface Relay Relay, Socket, LED Module, — Siemens · SKU: LZS:RT3A4L24 · TRY 1,710.00 · Made to order
- Siemens LZS:RT3A4T30 Coupling Relay — Siemens · SKU: LZS:RT3A4T30 · TRY 1,974.00 · Made to order
- Siemens LZS:PT5A5T30 Coupling Relay — Siemens · SKU: LZS:PT5A5T30 · TRY 1,780.00 · Made to order
- Siemens LZS:PT3A5R24 Interface Relay Label, including clip mechanism — Siemens · SKU: LZS:PT3A5R24 · TRY 1,651.00 · Made to order
- Siemens LZS:RT4A4R24 Interface Relay Label, including clip mechanism — Siemens · SKU: LZS:RT4A4R24 · TRY 1,794.00 · Made to order
- Siemens LZS:PT5A5R24 Interface Relay Label, including clip mechanism — Siemens · SKU: LZS:PT5A5R24 · TRY 1,651.00 · Made to order
- Siemens LZS:RT4A4L24 Interface Relay Relay, Socket, LED Module, — Siemens · SKU: LZS:RT4A4L24 · TRY 1,794.00 · Made to order
- Siemens LZS:RT3A4R24 Interface Relay Label, including clip mechanism — Siemens · SKU: LZS:RT3A4R24 · TRY 1,710.00 · Made to order
- Siemens LZS:PT3A5T30 Coupling Relay — Siemens · SKU: LZS:PT3A5T30 · TRY 1,780.00 · Made to order
- Siemens LZS:PT5A5L24 Interface Relay Relay, Socket, LED Module, — Siemens · SKU: LZS:PT5A5L24 · TRY 1,651.00 · Made to order
- Siemens LZS:PT3A5L24 Interface Relay Relay, Socket, LED Module, — Siemens · SKU: LZS:PT3A5L24 · TRY 1,651.00 · Made to order
- Siemens LZS:RT4A4T30 Coupling Relay — Siemens · SKU: LZS:RT4A4T30 · TRY 2,036.00 · Made to order
- Siemens LZX:PT570524 Coupling Relay — Siemens · SKU: LZX:PT570524 · TRY 745.00 · In stock
- Schneider Electric RUMC21BD 2 pole changeover contact, universal relay, 24VDC — Schneider Electric · SKU: RUMC21BD · TRY 1,061.95 · In stock
- Siemens LZX:PT370730 Coupling Relay — Siemens · SKU: LZX:PT370730 · TRY 846.00 · Made to order
- Schneider Electric RUMC31B7 3 pole changeover contact, universal relay, 24VAC — Schneider Electric · SKU: RUMC31B7 · TRY 1,156.47 · In stock
- Siemens LZX:PT370524 Coupling Relay — Siemens · SKU: LZX:PT370524 · TRY 734.00 · Made to order
- Schneider Electric RUMC31P7 3 pole changeover contact, universal relay, 230VAC — Schneider Electric · SKU: RUMC31P7 · TRY 1,256.55 · In stock
- Siemens LZX:PT270730 Coupling Relay — Siemens · SKU: LZX:PT270730 · TRY 816.00 · Made to order
- Schneider Electric RPM21P7 230 V AC Power Relays — Schneider Electric · SKU: RPM21P7 · TRY 939.64 · In stock
- Schneider Electric RPM21B7 24 V AC Power Relays — Schneider Electric · SKU: RPM21B7 · TRY 906.28 · In stock
- Schneider Electric RUMC21B7 2 pole changeover contact, universal relay, 24VAC — Schneider Electric · SKU: RUMC21B7 · TRY 1,073.07 · Made to order
- Schneider Electric RPM21BD 24 V DC Power Relays — Schneider Electric · SKU: RPM21BD · TRY 878.48 · In stock
- Siemens LZX:PT570730 Coupling Relay — Siemens · SKU: LZX:PT570730 · TRY 865.00 · In stock
- Siemens LZX:PT370024 Coupling Relay — Siemens · SKU: LZX:PT370024 · TRY 734.00 · In stock
How to choose Standard Relays
Standard relays are electromechanical relays with two or four changeover (CO) contacts, used with a socket in panel control circuits. They are used to obtain multiple independent contacts from one control signal, build latching (seal-in) circuits, and switch loads such as pilot lights, valves and contactor coils.
- Separate sensing, motion control, logic processing and operator interface requirements.
- Select signal type, supply voltage, communication protocol and I/O count for the machine network.
- Verify housing size, sensing distance and PNP/NPN output polarity against the PLC input card.
Frequently asked questions
What is Standard Relays and where is it used?
Standard relays are electromechanical relays with two or four changeover (CO) contacts, used with a socket in panel control circuits. They are used to obtain multiple independent contacts from one control signal, build latching (seal-in) circuits, and switch loads such as pilot lights, valves and contactor coils.
What should I compare when choosing Standard Relays?
Select the coil voltage according to the voltage and type of the control circuit, the number of contacts according to the number of independent circuits you need, and the contact current according to the current of the load.
Where can I find technical details for Standard Relays products?
A standard relay has mechanical contacts; for heater loads that switch on and off very frequently, it is not a substitute for a solid state relay (SSR).
Standard Relays Selection Guide: Technical Criteria and Engineering Practice