CM Micro Switch

A micro switch, also known as snap-action switch, is a generic term used to refer to an electric switch that is actuated by very little physical force, through the use of a tipping-point mechanism. They are very common due to their low cost and durability, greater than 1 million cycles and up to 10 million cycles for heavy duty models. This durability is a natural consequence of the design. Internally a stiff metal strip must be bent to activate the switch. This produces a very distinctive clicking sound and a very crisp feel. When pressure is removed the metal strip springs back to its original state. Common applications of micro switches include the door interlock on a microwave oven, levelling and safety switches in elevators, vending machines, and to detect paper jams or other faults in photocopiers. Micro switches are commonly used in tamper switches on gate valves on fire sprinkler systems and other water pipe systems, where it is necessary to know if a valve has been opened or shut.
The defining feature of micro switches is that a relatively small movement at the actuator button produces a relative large movement at the electrical contacts, which occurs at high speed (regardless of the speed of actuation). Most successful designs also exhibit hysteresis, meaning that a small reversal of the actuator is insufficient to reverse the contacts; there must be a significant movement in the opposite direction. Both of these characteristics help to achieve a clean and reliable interruption to the switched circuit.

CS Series

CM Series

CZ Series

Features

Virous of actuators, action position is adjustable (such as CM1701)

High switch on and off capacity(15A)

High accuracy

Wide range of operation speed

Each type of CM series has solder terminal, screw terminal and tab terminal are selective

Add A for solder terminal, add C for tab terminal, blank for screw terminal

Contact Form

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Ratings

Rated Voltage (V)	Noninductive Load (A)				Inductive Load (A)				Inrush Current
	Resistance Load		Lamp Load		Inductive Load		Motor Load
	NC	NO	NC	NO	NC	NO	NC	NO	NC	NO
125VAC 250VAC 500VAC	15 15 3		3 2.5 1.5	1.5 1.25 0.75	15 15 2.5		5 3 1.5	2.5 1.5 0.75	30 max.	15 max.
8VDC 14VDC 30VDC 125VDC 250VDC	15 15 6(2) 0.4 0.2		3 3 3 0.4 0.2	1.5 1.5 1.5 0.4 0.2	15 10 5 0.05 0.03		5 5 5 0.05 0.03	2.5 2.5 2.5 0.05 0.03

Characteristics

Operation speed	0.01mm-1m/sec
Operating frequency	Mechanical: 240 operations/min.
	Electrical: 20 operations/min.
Contact resistance	15mΩ max. (initial value)
Insulation resistance	100mΩ min. (at 500VDC)
Dielectric strength	1000VAC, 50/60HZ for 1 minute between terminals of the same polarity
	1500VAC, 50/60 HZ for 1 minute between currentcarrying and non-current-carrying metal parts
	1500VAC, 50/60 HZ for 1 minute between each terminal and ground
Vibration frequency	10-55HZ,1.5mm double amplitude
Shock	Mechanical durable: 1, 000m/Sec2 (about 100G'S) Malfunction: 300m/Sec2 (about 30G'S)
Ambient temperature	General purpose type: -25℃ to +80℃, Sealed type: -15℃ to +80℃
Humidity	General purpose type: 85% RH max., Sealed type: 95% RH max.
Life	Mechanical: 20,000,000 operations min. Electrical: 500,000 operations min.
Weight	About 22g to 58g
Degree of protection	IP65

Operating characteristics

Models	CM1300	CM1301	CM1303	CM1305	CM1306	CM1307	CM1308	CM1309	CM1701
OF Max.	350g	300g	300g	350g	350g	350g	350g	350g	70g
RF Min.	114g	50g	50g	114g	114g	114g	114g	114g	14g
PT Max.	0.4mm	4mm	4mm	0.4mm	0.4mm	0.4mm	0.4mm	0.4mm	10mm
OT Min.	0.13mm	1.6mm	1.6mm	1.6mm	1.6mm	5.5mm	3.58mm	3.58mm	5.6mm
MD Max.	0.05mm	1.3mm	1.3mm	0.05mm	0.05mm	0.05mm	0.05mm	0.05mm	1.27mm
FP Max.		20.6mm	31.8mm						28.2mm
OP(mm)	15.9 ±0.4 mm	17.4 ±0.8 mm	28.6 ±0.8 mm	28.2 ±0.5 mm	21.5 ±0.5 mm	21.50. ±8 mm	33.4±1.2 mm	33.4±1.2 mm	19 ±0.8 mm

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Models	CM1702	CM1703	CM1704	CM1705	CM1743
OF Max.	160g	100g	160g	10g	160g
RF Min.	28g	22g	42g	3g	42g
PT Max.	5mm	7.1mm	2.7mm	20mm	2.7mm
OT Min.	2mm	4mm	2.4mm	5.6mm	2.4mm
MD Max.	1mm	1.02mm	0.5mm	3mm	0.5mm
FP Max.	24.8mm	36.5mm	32.5mm		43.6mm
OP(mm)	19 ±0.4 mm	30.2 ±0.8 mm	30.2 ±0.4 mm	19±0.4 mm	43.1 ±0.8 mm

Definitions of operating characteristics:

OF: operating force
Force needed to add to the executer unit to actuate switch contact
RF: releasing force
Force needed to add to the execter unit to make the switch contact back to normal position
TF: total force
Force needed to make executer unit move from free position to limitation position
FP: free position
Primary position of executer unit without external force adding to executer unit
OP: operating position
The position of executer unit in case of the contact rapidly moving to the contact position for action
RP: releasing position
The position of executer unit in case of the contact rapidly backing to normal position to action contact position
TTP: total tavel position
The position of executer unit in case of executer unit reaching the limitation position
PT: pretravel
The distance or angle that the executer unit passes since free position to action position
OT: overtravel
The distance or angle that the executer unit surpasses action position
MD: movement differential
The distance or angle from action position to reversion position
TT: total tavel
The distance or angle represents the movement till action and the total movement after all actions.

Terminal Type