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Bestact Products > Limit Switches > Heavy Duty Limit Switches > Type PSKU-R25CO  

Type PSKU-R25CO, Pull Lever (Crane Drum) Over-Winding Protection

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High Reliability Superior to That of Non-Contact Type by Employing Double and Triple Barriers. Best Suited for Heavy Duty Application due to Outstanding Environmental Immunity

Features
  1. Complete floodtight and gas resistance:Outstanding environmental immunity is assured by employing floodtight, corrosion-resistant construction and through use of hermetically sealed contact.
  2. Long-term maintenance free :This is achieved through the combination of the actuator exhibiting high mechanical strength as well as internal vane-action magnetic proximity switch featuring high electrical reliability, assuring long-term maintenance-free operation.
  3. Powerful contact:Inductive load of 115VDC 0.3A can be directly controlled without using an amplifying relay or protective circuit.
  4. No contact chattering :Since large actuator movement is considered in design, the switch is not ill-affected by operational shock or vibration. Therefore, electrical circuit can be simplified.
Typical Applications
  • Steel plant equipment
  • Large-size transportation machinery
  • Material handling equipment
  • Cement producing equipment
Types with # such as PSKU-#R25A can vary depending upon the contact arrangement 1NO [100], 1NC [010], 2NO [200], 2NC [020], 1NO1NC [110]




 Specifications   DEGREES OF PROTECTION (IEC Standard 529)   

Contact Arrangement Available1
1NO (1-way operation)
1NC (1-way operation)
2NO (1-way operation)
1NO1NC (1-way operation)
2NC (1-way operation)

Common Specifications
Enclosure: Floodlight type (IP 56)Note
Rated insulation voltage: 250V
Rated continuous current: 3A
Operational power ratings: 240VAC 0.5A, 115VDC 0.3A, 48VDC 0.5A
Withstand voltage: 500VAC for 1 minute across contact, 1500VAC for 1 minute across contact to ground
Operating temperature: - 10 to +80°C
Storage temperature: -25 to +90°C
Maximum recommended speed of actuation: 100m/min (Heat-resistant, corrosion-resistant type PSDH is available on order. )
Operating frequency: 3600 times/hour
Mechanical life: 5,000,000 operations or greater
Electrical life: 240VAC 5A making 0.5A breaking 1,000,000 operations or greater (Inductive load)
115VDC 50mA 5,000,000 operations or greater (Inductive load)
Lead-in method: PF 1/2 (13 diameter hole)

Note
Type PSKU-#R25AO for crane drum over-winding protection will not restrict. However, after the contact has turned off, effective measures should be taken to lessen the effect of accidental turn on due to shock or vibration.
1 Change of NO contact to NC contact cannot be done by user.


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·  Dimensions in mm


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