The Allen-Bradley 440N-S32015 is a magnetic non-contact safety switch from the Sipha S21 series.
Unlike the RFID-based SensaGuard units we discussed earlier, the Sipha line uses a specific arrangement of magnetically sensitive reed elements. This makes it more tamper-resistant than a standard reed switch, but it must be used with a dedicated Sipha Control Unit (like the 440N-S26001) to achieve a safety rating.




























