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On three phase machines models 1 and 2, the two fans are single phase and are protected by MCBs whilst the compressor is protected by a three phase motor rated circuit breaker. On Deltas 4 to 16 the compressor is also protected by a phase rotation relay. 9. Delta 14 and Delta 16 are fitted with an economy switch allowing the user to select between Three phase, duplex alternating pump control with override. Simply add the appropriate overload modules. The Model 32XR control panel is designed to alternately control two three phase pumps in industrial and commercial water and sewage systems using a 4-20 mA level transmitter.