When do I use a FSM (Field Sensitive Magnetic) type switch vs. FSMmech (Field Sensitive Mechanical) type?
(See Bulletin #15600) The primary determinant will be the lifetime capability of the switch required by the application; normally cycle switch life is desired to be a minimum of 3 to 5 years of operation. Intermittently-applied lubrication systems might typically be operated only 4 times per hour for one switch cycle. These types of applications can use the more economical FSMmech type of switch where its 10 million+ life rating will give years of reliable use. Re-circulating oil types of systems, however, can accumulate millions of switch cycles per year, so the longer lived FSM type of switch is the more logical candidate due to its 150 million+ life rating. There are both AC and DC control power versions of each type of switch available for MSP, MXP, and MGO applications.
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