Step Relays | McMaster-Carr

	Input Voltage Input Voltage

	Switching Voltage Switching Voltage

24V AC

120V AC

	Number of Circuits Controlled Number of Circuits Controlled

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

2 Off (Normally Open)

1 Off (Normally Open) and 1
On (Normally Closed)

	Industry Designation Industry Designation

SPST-NO

DPST-NO

DPST-1NO/1NC

	Number of Terminals Number of Terminals

	Switch 2nd Signal Starting Position Switch 2nd Signal Starting Position

1 On (Normally Closed)

1 On (Normally Closed) and 1
Off (Normally Open)

2 On (Normally Closed)

	Control Power Control Power

6.5VA

	Specifications Met Specifications Met

CE Marked

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

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20 Products

Sequenced Latching Relays

These relays switch through a series of different circuit configurations every time they receive an input voltage. The input voltage latches them in position, so they don’t require a constant voltage to stay switched. Use them to control motors, pumps, and lighting. The covered terminals prevent contact with live connections. Mount to 35 mm DIN rail. Also known as step relays.

For technical drawings and 3-D models, click on a part number.

1 Circuit Controlled—SPST-NO
Switch Starting Position	Input Voltage	Control Power	Switching Current @ 24V AC/120V AC	Max. Switching Voltage	hp @ Switching Voltage	Ht.	Wd.	Dp.		Each
With 4 Terminals
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	000000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
2 Circuits Controlled—DPST-1NO/1NC
With 6 Terminals
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
2 Circuits Controlled—DPST-NO
With 6 Terminals
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000