Pros, Join Our TradeMaster Program!
1/4" Male SAE OMB-Series Compressor Crankcase with Junction Box (24V)

The OMB is a compressor crankcase oil level protective control ideal for use with Copeland Scroll? models ZF, ZB, ZR and ZS. It is also recommended for Copeland? brand products, Carlyle, Bitzer, and other semi-hermetic compressors.

  • Precision oil level measurement for maximum protection
  • Easy monitoring with alarm and status lights
  • Foam resistant design prevents nuisance trips unlike optical sensor designs
  • Contaminant proof operation ensures accurate control
  • Only approved oil level control for Copeland Scroll? Compressors
  • 5-time lockout feature protects compressor from repeated low oil level condition
  • Self-contained unit with oil level sensor and integral solenoid to manage oil level supply
  • Reverse Hall-effect sensor for precise measurement of oil level and protection from sensor magnetic debris contamination
  • SPDT output contact for compressor shut-down and alarming
  • Easy installation by sightglass replacement
  • Adapters suitable for various types of scroll compressors (not required for reciprocating compressors)
  • UL Recognized (File Number# MP604)
  • Flourescent floating ball
  • Integral sight glass
  • Debris retention magnet for reliable operation

  • Maximum working pressure: 640 psi
  • Solenoid MOPD: 350 psi
  • Supply voltage: 24 V AC, 50/60 Hz
  • Solenoid coil: ASC 2L 24 V AC / 50/60 Hz
  • Current consumption: 0.6A
  • Time delay for low level signalling: 5-10 seconds
  • Time delay for after setpoint recovery: 5-10 seconds
  • Alarm delay time: 120 seconds
  • Alarm switch: SPDT
  • Alarm contact rating: 10A @ 125 / 5A @ 220V AC / 50/60 Hz
  • Refrigerant compatibility: HFC, HCFC, CFC
  • Oil temperature: 180°F Max.
  • Storage and transport temperature: 140°F Max.
  • Operating ambient temperature: 120°F Max.
  • Oil supply fitting: 1/4? Male SAE
  • UL/CUL file number: SA8547
  • Transformer VA requirements* 25?
Hide Description


Max. Working Pressure:

640 PSI



Auxiliary Switch:


Fitting Size (inches):


Connection Type:

SAE Flare

Refrigerant Type:





Product Review

Product Q&A

Add-on Item

This item is cost-prohibitive to ship on its own but is available to ship with orders over $200.

Why don't we show the price of this item?

We try to always offer you the lowest prices possible, but some manufacturers require that we only show these low prices once you take further action.

To see the price, simply add the item to your cart or sign in.