NIPPON GEAR

NIPPON GEAR

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
Total travel : TT 38° 35° 38° 35°
Recommended travel : RT 13° 13°
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.

Documents and data Downloads

Product information

Limit Switch

Limit Switch

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