TÜV SÜD Certification for Safety Components Safety Door Switches[Compact Non-contact Door Switches] Safety Key Selector Switch Please contact us for details. Used aloneEN60947-5-3EN ISO 13849-1 Used in a set with the F3SXEN61496-1IEC61496-2EN ISO 13849-1 Used in a set with the G9SPEN ISO 13849-1 AC-15 3A 240V 50/60HzDC-13 0.27A 250V AC-15 1.5A 120V 50/60HzDC-13 0.22A 125V AC-15 3A 240V 50/60Hz DC-13 0.27A 250V AC-15 0.75A 240V 50/60HzDC-13 0.27A 250V AC-15 3A 240V 50/60Hz.DC-13 0.27A 250V AC-12 3A 250V DC-12 3A 30V AC-12 0.5A 250V DC-12 1A 30V AC-15 3A 220VDC-13 1.5A 24VDC-13 0.55A 125VDC-13 0.27A 250V AC-15 0.75A 240V 50/60Hz DC-13 0.55A 125VAC-15 0.75A 240V 50/60HzDC-13 0.55A 125V(Emergency Stop Switch) AC-12 3A 250V 50/60HzDC-12 3A 30V(Pushbutton Switch) AC-12 0.1A 125V 50/60HzDC-12 0.1A 30VWhat you will learn from Refrigeration Pressure SwitchesA question from one our readers - What are refrigeration pressure switches and how pressure switches protect the refrigeration circuit.

All about high-pressure refrigeration switchesAll about low-pressure refrigeration switchesBenefits of refrigeration pressure switchesLots of related links to help you learn moreRichard - What are pressure switches used for in refrigeration circuits and how do pressure switches protect the system from further damage?Refrigeration Pressure Switches | HVAC SystemsThanks for the question and for being a reader of High Performance HVAC! First there two types of basic refrigeration switches in the typical high-grade residential system. I say high grade because not every refrigeration system in air conditioners and heat pumps have switches to protect the refrigeration system.High-Pressure Refrigeration Pressure Switches - The high-pressure switch will kill the compressor circuit if the pressure exceeds the rating on the pressure switch. The ratings will vary depending on the type of refrigerant the air conditioner or heat pump uses in the system. On some air conditioners or heat pumps this switch is manually reset only simply because if it trips there is definitely a problem that needs to be resolved before the system should run again.

On Rheem and Ruud heat pumps and air-conditioners, the reset button is usually red on located near the control panel. A simple push of the switch will reset the switch and the operation of the air conditioner should return to normal until the pressure exceeds the rating of the switch.Things that can cause the high-pressure switch to trip include:Bad condenser fan motorCondenser Coils plugged up with dirt and debrisFins on the coils bentBlockage in the refrigeration systemThese issues, if they exist, should be taken care of before the switch is reset. The high-pressure switch prevents the system from operating at extremely high pressures. Continuously resetting the switch without taking care of the problem will lead to possible catastrophic failure of the system resulting in higher repair cost. Low Refrigeration Pressure Switches - The low-pressure switch is typically an automatically reset switch that will reset itself when the pressure on the low-pressure side of the refrigeration systems returns to normal or above the setting on the switch.

When a refrigeration system operates at lower than normal pressures the system can freeze up with the freezing beginning at the evaporator coil and working its way back to the compressor via the suction line. ac units in arizonaFreezing of the refrigeration system is bad and lead to liquid refrigerant slugging in the compressor which can lead to compressor failure. air conditioning unit operationThings that can cause the low-pressure switch to trip include:Low refrigerant charge from a refrigerant leakBlower motor failure in the air handlerPlugged evaporator coils or a blockage of air flowFailure of a refrigeration component in the refrigeration system Again, if these issues exist in the refrigeration system they need to be addressed to prevent the low-pressure switch from tripping. 20 ton ac unit cost

In some cases such as catastrophic failure or loss of the refrigerant charge the system will not run at simply because the controls were engineered correctly to prevent short cycling however it is possible the system can short cycle especially if the condenser has been re-engineered with aftermarket parts by someone who knew enough to be dangerous. This includes myself in certain instances however I always do my best to think things through before making a change to the system. After all, solving one problem only to create another problem is not fixing the HVAC system. Number one is safety and reliability and number two is protecting the system from permanent damage keeping number one in mind.These switches are used for a specific purpose and re-engineering the HVAC system can create other problems. It is also important that the person making the changes is competent or has someone competent review the changes to make sure other problems will not be created. When engineered properly these devices can protect the system and save you tons of money in the event of a catastrophic failure of the system for any reason whether it is a system defect or it is a child playing that damages the unit.

You can learn more about refrigeration and HVAC here.Sipha 440N Magnetic Non-Contact Safety Switch, Coded Actuator, Plastic, 250 V ac, 300 V dc Allen-Bradley Sipha S2 Non-contact Safety Switch The Sipha S2 is a non-contact switch in a slim ABS housing with moulded-in brackets, making it extremely versatile and simple to install. It incorporates several magnetically sensitive elements, which must be triggered in a particular sequence to operate correctly. It is designed to operate with its own actuator to help prevent the switch being defeated by a simple magnet. The Sipha S1 must be connected to the Sipha control unit to provide a monitored circuit. Coding meets the requirements of more complex applications where simple magnetically actuated switching may not be sufficientHead & actuator are IP67 rated, which is ideal for steam cleaning or high pressure hosing downNon-contact actuationMagnetic coded sensingSlim moulded ABS housing, 82x19x19mmMust be operated with its own safety control unit