Limit Switch
Limit Switch
SR Series
Outline
We offer two-circuit double-break and four-circuit double-break types.
The SR Series limit switch activates when the lever is pulled to either the left or right.
Features
- High reliability:
Developed for machines, equipment, and plants that require high reliability. - High rigidity:
The whole unit including the inside switch and the operating mechanism is composed with high rigidity. - Snap action:
With the improved snap-action structure, the high-speed and breaking capacity is increased. - Selected material:
Made with carefully selected materials and precise manufacturing,
Our Limit switch ensures reliable operation and long life.
Technical Specification
■Container structure
Made of Corrosion-resistant and aluminum die-casting,
the structure is oil-proof, dust-proof, and waterproof.
■Operating mechanism
The snap-action mechanism is designed to operate at high speed.
■Contacts
The wiping motion of the butt-type silver contacts ensures high capacity and reliable operation. Additionally, each circuit is electrically isolated.
■Lever
The rotation direction can be easily changed by moving the internal return spring between the left and right. Additionally, the lever position can be set to any desired position within 180°in increments of 7°30’.
■Ambient Temperature
-20℃~+90℃
■Humidity
95% RH MAX
■Rating
●AC current
Rated Voltage (V) | 125 | 250 | 500 | ||||||
---|---|---|---|---|---|---|---|---|---|
Load | Resistance | Inductance | Motor | Resistance | Inductance | Motor | Resistance | Inductance | Motor |
Open/Close Current (A) | 20 | 15 | 7.5 | 15 | 10 | 5 | 5 | 3 | 2 |
●DC current
Rated Voltage (V) | 8 | 14 | 30 | 125 | 250 | |||||
---|---|---|---|---|---|---|---|---|---|---|
Load | Resistance | Inductance | Resistance | Inductance | Resistance | Inductance | Resistance | Inductance | Resistance | Inductance |
Open/Close Current (A) | 20 | 15 | 20 | 15 | 10 | 7 | 5 | 3 | 1.5 | 1 |
■Operating angle and operating force
Item | Type | |||
---|---|---|---|---|
SR22N | SR22S | SR42N | SR42S | |
Trip travel : PT | 10° | 6°30′ | 10° | 6°30′ |
Reset travel : MD | 8° | 4° | 8° | 4° |
Total travel : TT | 38° | 35° | 38° | 35° |
Recommended travel : RT | 13° | 7° | 13° | 7° |
Operating toque (kg-cm) | 23 | 30 | 38 | 40 |
■Dimensions and mounting diagram
●SR22(two-circuit double-break)
SR22NTAR
SR22NTAL
SR22STAR
SR22STAL
SR22NTBR
SR22NTBL
SR22STBR
SR22STBL
SR22NTCR
SR22NTCL
SR22STCR
SR22STCL
●SR42(four-circuit double-break)
SR42NTAR
SR42NTAL
SR42STAR
SR42STAL
SR42NTBR
SR42NTBL
SR42STBR
SR42STBL
SR42NTCR
SR42NTCL
SR42STCR
SR42STCL
Note 1: () indicates inch screws.
Note 2: () The chain double-dashed line indicates the lever position for type B.