Limit switch SERIE MP720

A sealed position switch, with positive opening operation, dual breaking, with direct connection by cable moulded into the housing. The degree of safety sought on a machine often depends on the reliability of a switch, especially during an emergency shutdown.
The MP720 series provides this guarantee thanks to the switch’s positive opening operation and the rigid mechanical linkage between the controller and the contact bridge causing the breaker circuit to open.

Descriptions

Approval	EN 947-5-1
Housing	Glass fiber reinforced
Mechanism	Forced break Slow action
Contact	Fine Silver, Gold contact upon request
Circuit	1 NO + 1NC
Termination	Cable moulded 0.75 mm² PVC -20°C to 70°C PUR -40°C to 90°C SI -40°C to 130°C
Actuator	Variety of operation heads Stainless steel

Degree of protection	IP67
Power rating	AC-15 3A DC-13 0.27A
Thermal current	6A
Dimensions	50 x 30 x 16 mm

Operating temperature range	-25°C to +70°C (suited for -40°C to +130°C)
Mechanical life	10 x 10⁶cycles

Actuators

DOMED PLUNGER The actuator must be operated axially. Vertical button operating speed >1mm/s. Switching diagram * = Positive opening operation travel (smp) In free position, a clearance of 0.5 to 1.0 mm has to be left from the top of the actuating button. The plunger must not be used as a mechanical endstop. Plunger actuators with a M12x1 male threaded collar must be secured by that collar using the nuts provided for that purpose.
Type 1G : Metal plunger
	Actuating force Fa max. (N) Positive operating force Fmp min (N) Free position Pr (mm) Positive openning operation position Pmp max. (mm)	4.0 10.0 20.5 ± 0.5 16.60
Type 1GA : Metal plunger with nuts
	Actuating force Fa max. (N) Positive operating force Fmp min (N) Free position Pr (mm) Positive openning operation position Pmp max. (mm)	4.0 10.0 35.0 ± 0.5 31.10
ROLLER PLUNGER This may be operated by means of a rotating or sliding cam. A cam the angles of which are in excess of 40° or the speed of which is in excess of 2m/s must not strike the roller plunger. The contact point must be directly above the axis of the roller. Switching diagram * = Positive opening operation travel (smp) The strike angles and position must be so calculated as to avoid a violent shock to the roller ; the cam must be so shaped as to ease the roller back to the free position.
Type 1GLA : Metal roller plunger
	Actuating force Fa max. (N) Positive operating force Fmp min (N) Free position Pr (mm) Positive openning operation position Pmp max. (mm)	4.0 10.0 30.0 ± 0.5 26.10
Type 1GTA : Metal roller plunger
	Actuating force Fa max. (N) Positive operating force Fmp min (N) Free position Pr (mm) Positive openning operation position Pmp max. (mm)	4.0 10.0 30.0 ± 0.5 26.10
Type 1GALA/1GATA : Metal longitudinal / transverse roller plunger with nuts
	Actuating force Fa max. (N) Positive operating force Fmp min (N) Free position Pr (mm) Positive openning operation position Pmp max. (mm)	4.0 10.0 47.0 ± 0.5 43.10

ROLLER LEVER 4G The actuator 4G is recommended for rapid movements although sharp movements and shocks to the roller should be avoided. The lever must be eased back to the free position. Strike angle : 30° Maximum speed: 5m/sec. Switching diagram (4G..) * = Positive opening operation travel (smp)
Type 4GXXP : Lever with nylon roller
	Actuating force Fa max. (N) Positive operating force Fmp min (N) Free position Pr (°) Positive openning operation position Pmp max. (°)	1.0 2.5 0 58

Switching diagram

Cable isolation	Polyvinyl chloride	Polyurethane	Silicone
Code in the reference of the article	PVC	PUR	SI
Element of contact Za form

Terminology - Samples applications

Pmp	Positive opening operation position. Actuator position at the point where the positive opening of the contacts is achieved. Position of the actuator when the positive opening operation on the circuitbreaking contacts has been achieved. Position in, which pre-determined dielectric voltage rating requirements is met between the open contacts in the switchable circuit.
smp	Positive opening operation travel. The minimum distance between the start of the movement of the actuator and the position where the positive opening of the contacts is achieved. Distance between the rest position and the positive opening operation position.
Fmp	Positive opening operation force. The actuating force applied to the actuator to cause it to achieve the positive opening operation.

Sliding door (lateral movement) In this case also the switch has to be operated as the door opens. Care has to be taken to ensure that the positive opening operation switch remains in that position during the full open travel of the door. Protective doors of this type are generally used on machines operating at high revolutions with cooling fluids. Consequently, it is essential in such applications that a switch with IP67 protection be used.
Hinged door (rotating) The problem with fitting a positive opening operation position switch to a hinged door is that the switch has to be operated as the door opens. Hence, the switch cannot be operated directly by the door but rather via a notched cam.

Information commande

	MP72	0	- 0 -	1G	/	4	2	PVC
Contact material 0: Silver contact 1: Gold contact
Actuator 1G: Metal plunger 1GA : Metal plunger with nuts 1GLA : Metal roller plunger 1GTA : Metal roller plunger 1GALA : Metal plunger longitudinal roller with nuts 1GATA : Metal plunger transverse roller with nuts 4GXXP : Lever with nylon roller
Number of wire 4 : 4 Wires section 0.75 mm²/ 19 AWG
Length of cable 1 : Length 1m 2 : Length 2m 4 : Length 4m
Cable material PVC : Polyvinyl chloride PUR : Polyurethane SI : Silicone

3D Models available upon request