| ◈ 4MM Series ◈ |
| The Texas Instruments 4MM provides
battery pack protection for laptop computers, cellular phones, protable tools |
| and more. By protecting against
overload and limited short circuit, the 4MM can in many cases replace two device |
| thuseproviding a signfcaant total cost
of ownership advantage. |
| ◈Operation◈ |
| The 4MM uses the same snap-action
principle of other KLIXON protectors. The bi-metal disc senses both heat |
| heat and current from the battery pack
When the temperature of the disc reaches a predetermined calibration point |
| the disc snaps open the contacts,
thus breaking the current path When the battery returens to a nomal operting |
| range, the 4MM protector resets(closes
circuit) automatically. |
| ◈Overcharge & Limited
Short Circuit Protection ◈ |
| Overcharge the 4MM sense heat buildup in the battery
pack,characteristic of an overcharge condition and the |
| disc snaps open the contacts at the predetermined
calibration point the wide differential between the open and |
| cosing temperature of the disc cause the 4MM to cycle
slowly during a prolonged fault condition, this ensures |
| the average temperature fo the battery will be kept overall
life of the pack. |
| short circuit -current passes from the lead through the
current sensitive armature, during a short circuit condition, |
| the lapid increase in current will generate I2R
heating in the arm. Materials are available with varying resistances |
| shich control the current sensitivity of the device(see
table). The non current carrying bimetal disc senses this |
| theat hrough convection and snaps open the contacts thus
beraking the circut. When the
falut condition is |
| removed and current returns to a nomal level, the disc will
reset the circuit to its nomally closed position. |
| ◈Coding ◈ |
◈Technical Characteristics ◈ |
| 4MMXXZ-YY |
Dielectric |
| 4MM-Series identification |
1500 VAC/1Min |
| XX-Opening Tempearature |
◈Maximum Berking Current of Battery
◈ |
| Z-Arm Material |
Up to 120A DC |
| YY-Lead Configuration |
|
| ◈Termination ◈ |
| Standard nickel strip leads with
customer specifiled lengths (Mylar insuration also available) |
| ◈Operting Temperatures
◈ |
|
Nominal |
Tolerance |
| Open |
45 to 85℃* |
±5℃ |
| Close |
45 to 65℃ |
±9℃ |
|
| ◈UL Recognized ◈ |
| File # E34618 |
| 12V DC 5A continuous load (5K cycles) |
| 200 Amp Limited Short Circuit |
| ◈CSA Certifed ◈ |
| File # RL31093 |
| ◈Performance Curvs
(Approximate : to be used for selecting samples only) ◈ |
[U/TPerformance Curve] |
|
[U/TPerformance Curve] |
| ULtimate trip current vs. delta temperature between |
|
Average first cycle tripping time vs. current in 25℃ |
| protector openning temperature and protectorambient |
|
ambient. These are approximate curves, to be |
| temperature. These are approximate curves, to be used |
|
used only for selecting sample for verification test. |
| only for selecting sample for verification test. |
|
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|
 |
|
| ◈Dimensional Specifications
◈ |
 |
|
| [Am Material Specifications] |
| Type |
Arm Material |
Resistance * |
| A |
Ti-Cu |
20milliohms |
| B |
Be-Cu |
20milliohms |
| C |
Ni-Cu |
30milliohms |
| D |
s-s |
60milliohms |
|
| * Without Leads |
| [Cycle Life] * |
| Type |
Amps(@12 VDC) |
| 100 cyles |
5000 cyles |
| 4MMXXA-YY |
80A |
50A |
| 4MMXXB-YY |
120A |
50A |
| 4MMXXC-YY |
50A |
30A |
| 4MMXXD-YY |
30A |
20A |
|
| * Recommended maximum usage |
|
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|
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