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Battery Protectors |
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Products |
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For A and AA Cells: |
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Data Sheets |
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Contacts |
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See Also |
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Overcharge Protection
The MM protector senses heat build-up in the battery pack, characteristic of an overcharge condition. The disc snaps open the contacts at the predetermined calibration point. The wide differential between the open and closing temperature of the disc causes the MM to cycle slowly during a prolonged fault condition. This ensures the average temperature of the battery will be kept within safe limits, also adding to the overall life of the pack.
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 I 2R 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.
6MM: Current flows through the bimetallic disc so that the I 2R heating occurs in the disc. This generally results in a faster response.
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Cycle Life amps @ 12VDC
recommended maximum usage |
Device |
100 Cycles |
5K Cycles |
4MMXXA |
80A |
50A |
4MMXXB |
120A |
50A |
4MMXXC |
70A |
50A |
4MMXXD |
50A |
40A |
4MMXXG |
120A |
50A |
4MMXXH |
80A |
50A |
Device |
100 Cycles |
2K Cycles |
6MM |
80A |
50A |
* under minimum self-load voltage |
For definition of "XX" and A, B, C, D, G, H, see "Z" under Device Coding System in middle column of this page. |
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Device Code Example
4MM75C-01
means a 4MM, operating temperature of 75°C, NiCu arm material, 23.5 mm nickel strip termination.
6MM06AA-02
means a 6MM, operating temperature of 70°C, 23.5 mm nickel strip termination.
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Sensata > Products > Controls > Battery Protection >
Klixon® MM Series Battery Pack
Dual Overcharge and Short Circuit Protection
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Dual function: snap–acting over-temperature and short circuit protection |
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Automatic reset |
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Small size with chamfered edges allows flush-fit between A and AA cells |
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High quality and reliability |
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Fast thermal and current response |
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Comprehensive agency approvals (UL, CSA, VDE, TUV) |
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Nylon case provides insulated exterior |
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Available with various nickel strip, wire termination, and insulating sleeve options |
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Various agency recognitions: UL, CSA, VDE, TUV |
The MM family series of protectors offers rechargeable battery pack protection with Klixon dual–function over temperature and short-circuit bimetal protectors with self–reset.
By protecting against overcharge and limited short circuit, the MM series can in many cases replace two devices, thus providing a significant total cost of ownership advantage.
The MM series protectors use the same snap–action principle of other Klixon protectors. The bimetal disc senses both heat and current from the battery pack. When the temperature of the disc reaches a predetermined calibration point, the disc snaps open the contact, thus breaking the current path. When the battery returns to a normal operating range the MM protector resets automatically.
Qualifications |
File Number |
Product Recognition |
UL |
E34618 |
4MM: 24V, 3A (5K cycles) 4MM: 12V, 200A (short circuit) 6MM: 12V, 3A (5K cycles) |
CSA |
LR31093 |
4MM: 24V, 3A (5K cycles) 4MM: 12V, 200A (short circuit) 6MM: 12V, 3A (5K cycles) |
VDE |
4464.12-4510-1003 |
4MM: 24V, 5A (10K cycles) |
TUV |
R9451286 |
4MM: 24V, 3A (5K cycles) 6MM: 12V, 3A (5K cycles) |
Performance
Characteristics |
Dielectric Strength |
1500 VAC / 1 minute |
Maximum Breaking Current of Battery |
4MM: up to 120 amps, 12 VDC 6MM: up to 80 amps, 12 VDC |
Operating Temperature
in 5°C increments |
4MM: 45°C to 95°C 6MM: 70°C to 95°C |
Tolerance |
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Reset
depending on operating temperature |
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Applications
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Notebook computers |
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Rechargeable battery packs |
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Cellular telephones |
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Camcorders |
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Portable tools |
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...And more |
Device Coding System:
4MMXXZ-ZZ, 6MMXXYY-ZZ
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Where XX is the open temperature in °C (in increments of 5°C): |
Device |
XX |
4MM |
Open temperature °C (in increments of 5°C) |
6MM |
2-digit number for opening temperature bimetal type combination:
01 = open 75°C ±8°C
02 = open 70°C +10/-5°C
03 = open 80°C +5/-7°C
04 = open 75°C ±8°C
05 = open 95°C ±8°C
06 = open 70°C ±8°C
07 = open 80°C ±8°C
81 = open 70°C ±8°C
82 = open 75°C ±8°C |
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and Z is the internal components: |
Device |
Z |
4MM |
Arm material (A, B, C, D, G, or H):
A = Ti-Cu (20 milliohms resistance, no leads)
B = Be-Cu (20 milliohms resistance, no leads)
C = Ni-Cu (30 milliohms resistance, no leads)
D = S-S (60 milliohms resistance, no leads)
G = Be-Cu (20 milliohms resistance, no leads)
H = Be-Cu (20 milliohms resistance, no leads) |
6MM |
- - - |
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and Y is the bimetal type: |
Device |
Y |
4MM |
- - - |
6MM |
- - - |
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and YY is the termination type: |
Device |
YY |
4MM |
- - - |
6MM |
AA = Ni Plate
BB = Ni Bar |
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and ZZ is the 2-digit termination part number: |
Device |
ZZ - most popular shown below, other lengths and combinations are available |
4MM |
2-digit part number:
ZZ |
Nickel strip |
Insulation |
L1 |
L2 |
L3 |
L4 |
None |
- - - |
- - - |
- - - |
- - - |
01 |
23.5mm |
23.5mm |
- - - |
- - - |
06 |
23.5mm |
23.5mm |
13mm |
13mm |
24 |
25mm |
25mm |
15mm |
- - - |
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6MM |
2-digit part number:
ZZ |
Nickel strip |
Insulation |
L1 |
L2 |
L3 |
L4 |
None |
- - - |
- - - |
- - - |
- - - |
02 |
23.5mm |
23.5mm |
- - - |
- - - |
03 |
23.5mm |
23.5mm |
13mm |
13mm |
23 |
25mm |
25mm |
- - - |
15mm |
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