Safety Limit Switches

Features

Snap Action Mechanism Built-in Safety Limit Switches with Contact Forced Open Mechanism Absolutely Required to Make General Industrial Machines Applicable to EC Directives and to Acquire the CE Marking.

Safety Limit switch conforming to the EN 50041 standard.
UL/CSA/CE markings are provided, suitable for machines to be exported to North America and Europe.
N.C./N.O. electrically independent contact(Zb) is achieved with the snap action mechanism.
Use of twin-contact structure improves the contact reliability.
Mounting pitch compatible with that of LS general purpose limit switch having abundant excellent operation results.
A wide variety of actuators provided.
High sealing ability applicable to immersion proof type(JIS) and IP67(IEC 60529)

Performance

Standarts	Normative Standards	JIS C 4508/JIS C 8201-5-1, IEC 60947-5-1, EN 50041(mounting hole dimension only)
	Approved Standards	EN 60947-5-1 (TÜV)/ UL (E96090)/CSA
Structure	Contact Type	Zb (EN 60947-5-1)
	Contact shape	Rivet
	Terminal Shape	Screw (M3 round head screw with square washer)
	Protective structure	Immersion proof type (JIS), IP67 (IEC 529)
	Contamination degree of operating environment	Contomination degree 3(EN 60947-5-1)
Electrical Performance (1)	Electrical rating	See separate Table 1
	Dielectric strength	Between non-continuous terminals: 2,100Vac, 50/60Hz for 1min. Between each terminal and non-conducting metal part: 5,300Vac50/60Hz for 1min Between each terminal and ground: 5,300Vac, 50/60Hz for 1min Between different terminals:5,300Vac, 50/60Hz for 1min
	Insulation resistance	100MΩ or more (by 500Vdc Megger)
	Initial contact resistance	25MΩ or less ( 6 to 8Vdc, energizing current 1A, measured by voltage drop method)
	Recommended min. operating voltage/current	24V-10mA, 12V-20mA
Electrical performance(2)	Rated operating voltage	400Vac,250Vdc
	Rated energizing current	10A
	Rated frequency	AC voltage, 45 to 65Hz, and DC voltage
	Short-circuit protective device	BUSSMAN fast acting fuse KTK-10 (10A) or equivalent
	Rated insulation voltage	500Vac or 275Vdc
	Conditional rated short-circuit current	1,000A (with coil load)
	Switching over-voltage	Category 3 (IEC 204-1)
	Rated impulse withstanding voltage	6,000V
	Electrical protection	Class I and Class II (without use of grounding terminal) (IEC 536)
Mechanical Performance	Actuator strength	Roller lever type: 49N in operating direction for 1min. or more Plunger type: 93N in operating direction for 1min. or more Rod lever type: 12N in operating direction for 1min. or more
	Terminal strength	Withstand tightening torque strength of 1.0 N-m for 1 min.
	Impact resistance	300m/s², contact open is 1ms or less at free position and operation limit position.
	Vibration resistance	Frequency: 10 to 55Hz, Peak-to-peak amplitude: 1.5mm, Continuous 2hrs. Contact open is 1ms. or less at free position and operation limit position.
	Allowable operating speed	1mm/s to 0.5mm/s, min. speed: 0.1s or less in the unstable contact status Max. speed: Actuator should not be broken.
	Mechanical operating frequency	120 operations/min. or less
Life	Mechanical life	Lever Type: 15million operations or more. Plunger Type: 5million operations or more.
Life	Electrical life	100,000 operations or more (rated load, open/close frequency: 20 operations/min or less)
Environmental conditions	Operating temperature range	-25 to 70°C (No freezing allowed)
Environmental conditions	Operating humidity range	98%RH or less
Recommended tightening torgue	Body	5 to 6N-m(M5 screw)
	Terminal	0.6 to1.0N-m(M3 round head screw with square washer)
	Cover	1.3 to 1.7N-m(M4 screw)
	Head	0.8 to 1.2N-m(M3.5 screw)
	Roller lever	4 to 5.2N-m(M5 screw)

Table 1 Electrical Rating

EN 60947-5-1	UL508
AC-15: Ue=AC 400V, le=2A Ue=AC 240V, le=3A DC-13: Ue=DC 250V, le=0.27A	2A/400Vac General Use Load 3A/240Vac General Use Load 0.27A/240Vdc 0.55A/120Vdc