Patented Non-Contact Safety Interlock Switch

251 F7 GuardSwitch

Applications

• Requiring a "Fail-Safe" Switch Packaging Machinery
• Mixers, Blenders and Dryers
• Waste Compactors Food Products Machinery

General Specifications

Enclosure	Polyurethane Enamel-Coated Aluminum
Temperature Range	-40°F to 150°F (-40°C to 65°C)
Environmental	Hermetically Sealed Contact Switch
	Encapsulated in Polyurethane
NEMA Rating	1, 2, 3, 4, 4X, 5, 6, 12, 12K
Protection Class	IP 67
Response Time	5 msec
Life Cycles	100,000 Under Full Load;
	Up to 200,000,000 Under Dry Circuit
Lead Types/O.D.	SJTOW-A (K) 18/3 AWG / 0.33" (0.84cm)
UL/CSA	All Models

sensing face sensing face Actuator 251 Switch

Note: The F7 model has a patented "watch-dog" circuit which, when switch failure occurs, the fused watch-dog circuit will draw 4.0 Amps. The voltage supply must have a current capacity of 4.0 Amps. This results in an open, fail-safe condition.

Order Information		Electrical Specifications
Part Number	Contact1 Configuration	(AC/DC)	(AC/DC)	Load Rating Voltage Range Switch Current Max. (AC/DC) Resistance	Contact	Sense Range2 Break Range Nominal	Nominal	Break at Failure Max.	Lead Length
251-F7Z-12K	N.O.	100VA	100-120V AC	0.83A	0.5 Ohms	1.0" (2.5cm)	1.8" (4.5cm)	2.7" (6.8cm)	12' (3.6m)
150-Z	Actuator Only

Warning— Each electrical rating is an individual maximum and cannot be exceeded!

• Configuration with actuator away from the switch
• Proximity of ferrous materials usually reduces sense range typically by 50%. The shape and type of material cause a wide diversity of effects. Testing is required to determine actual sense range for specific applications.