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4MM Series (for "A" cells)
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Temperature calibration range 45°-110°C ±5°C |
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Up to 120 amps, 12 VDC |
With its plastic insulative case and snap–acting bimetal, it is sized to fit the inclusive area between two
adjacent "A" size cells. The 4MM offers dual–function (over-temperature and short circuit) protection
and automatic reset.
The 4MM was the first Klixon protector series designed specifically for the rechargeable battery pack market.
Short Circuit Protection
4MM: Current passes from the lead through the current sensitive arm. During short circuit conditions the rapid increase in current will generate I2R heating in the arm. Materials are available with varying resistances to control current sensitivity (see table). The non-current carrying bi-metal disc senses this heat through convection and snaps open the contacts, breaking the circuit. When fault condition are removed and current returns to normal the disc will reset the circuit to its normally closed position.
APPLICATIONS
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Rechargeable battery packs |
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6MM Series (for "AA" cells)
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Temperature calibration range 70°-95°C ±8°C |
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Current-carrying snap–action bimetallic arm for faster short-circuit response |
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Up to 80 amps, 12 VDC |
The 6MM was developed in 1992 with the advent of smaller "AA" sized rechargeable cells. The use of
a current carrying snap–action bimetal not only allows a smaller protector size, but also faster response to short circuit conditions.
Short Circuit Protection
6MM: Current flows through the bimetallic disc so that the I2R heating occurs in the disc. This generally results in a faster response.
APPLICATIONS
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Rechargeable battery packs |
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