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WMZ12A PTC thermistor

Article source:admin Popularity:Published time:2019-07-26 10:43

1. Scope of application:
  The WMZ12A PTC thermistor is mainly used for overcurrent protection of [transformer (adapter) / primary coil / charger / digital multimeter / smart meter / micro motor / transistor]. Directly connected in series in the load circuit, when the line is in an abnormal situation, it can automatically limit the over current or block the current, and then return to the original state after the fault is removed, commonly known as "10,000 times fuse"

2. Features:
• Non-contact circuit and component protection
• Automatically limit overcurrent
• Automatic recovery after troubleshooting
• No noise and no sparks when working
• Reliable and easy to use

3. Application principle:
Connect the WMZ12A PTC thermistor in series with the power circuit. When the circuit is in a normal state, the current flowing through the PTC is less than the rated current, the PTC is in a normal state, and the resistance is small, which does not affect the normal operation of the protected circuit such as the electronic ballast (energy-saving lamp, transformer, multimeter). When the circuit current greatly exceeds the rated current, the PTC suddenly heats up and the resistance suddenly increases to a high impedance state, thereby limiting or blocking the current and protecting the circuit from damage. After the current and current return to normal, the PTC also automatically returns to the low resistance state, and the circuit resumes normal operation.
WMZ12A PTC thermistor in the field of overcurrent protection applications such as electronic ballasts (energy-saving lamps, transformers, multimeters), Yaxun is the first to introduce the WMZ12 model featuring high withstand voltage (V ≥ 300V AC).

WMZ12 PTC thermistor
4. Product logo description:
 WMZ12A overcurrent / overheat protection series product logo

1Product series: WMZ12A overcurrent / overheat protection series PTC thermistor
2 switch temperature category: 75-75 ° C 105-105 ° C 120-120 ° C
3 chip diameter: S-Φ3 A-Φ5 B-Φ7 LB-Φ8 M-Φ10 SL-Φ13 LL-Φ19
4 nominal resistance: 82R-82Ω 4R7-4.7Ω 151-150Ω
5 resistance accuracy: N-±30% M-±20% k-±10% J-±5%
6 maximum no action current: 060-60mA 300-300mA

When using PTC as an overcurrent protection component, generally select the maximum non-operating current and the maximum operating voltage. At the same time, factors such as the external dimensions of the components, the rated zero-power resistance, and the operating temperature range should also be considered.
Generally, 1.2 to 1.5 times of the maximum operating current when the circuit is normally operated is the maximum non-operating current of the PTC;
The voltage that the line may apply to the PTC under normal or abnormal conditions should be no greater than its maximum operating voltage.
 
Type code Dmax Tmax F±1 d±0.05
S 4.5 4.5 5 0.5
L 5.5 4.5 5 0.6
A 6.5 4.5 5 0.6
B 8 4.5 5 0.6
LB 9 4.5 5 0.6
M 12 5 5 0.6
SL 15 5 7.5 0.8
LL 24 5 7.5 0.8
 
5. Main technical parameters:
• WMZ12A (I) is mainly used for overcurrent protection such as charger, adapter (primary coil), electric energy meter, digital multimeter, etc.

model MAX Non OperaTIng Current at 25℃ In (mA) Trip Current at 25℃ It (mA) Rated zero power resistance value R 25 (Ω) Maximum operating current I max (A) Dimensions(mm)
Dmax Tmax d±0.05 F±1
WMZ12A-70LB15RM080 80mA at 40℃±2℃ 160 15±20% 1.0 8 5 0.6 5
WMZ12A-70LB12RM090 90mA at 40℃±2℃ 180 12±20%
WMZ12A-70LB10RM100 100mA at 40℃±2℃ 200 10±20%
WMZ12A-75S222RM005 5 10 2200±20% 0.2 4 4.5 0.5 5
WMZ12A-75S152RM006 6 12 1500±20%
WMZ12A-75S102RM008 8 16 1000±20%
WMZ12A-75S681RM010 10 20 680±20%
WMZ12A-75S471RM012 12 24 470±20% 0.3
WMZ12A-75S331RM015 15 30 330±20%
WMZ12A-75S221RM018 18 36 220±20%
WMZ12A-75S151RM020 20 40 150±20% 0.4
WMZ12A-75S101RM025 25 50 100±20%
WMZ12A-75A471RM014 14 28 470±20% 0.4 6.5 4.5 0.6 5
WMZ12A-75A331RM017 17 34 330±20%
WMZ12A-75A221RM020 20 40 220±20% 0.5
WMZ12A-75A151RM024 24 48 150±20%
WMZ12A-75A121RM026 26 52 121 ±20%
WMZ12A-75A101RM028 28 56 100±20% 0.6
WMZ12A-75A68RM032 32 64 68±20%
WMZ12A-75A47RM040 40 80 47±20%
WMZ12A-75B331RM020 20 40 330±20% 0.8 8 4.5 0.6 5
WMZ12A-75B221RM025 25 50 220±20%
WMZ12A-75B151RM030 30 60 150±20%
WMZ12A-75B101RM035 35 70 100±20% 1.0
WMZ12A-75B82RM040 40 80 82±20%
WMZ12A-75LB82RM035 35mA at 60℃±2℃ 90mA at 25℃±2℃ 82±20% 1.0 9 4.5 0.6 5
WMZ12A-75LB68RM040 40mA at 60℃±2℃ 100mA at 25℃±2℃ 68±20% 1.2
WMZ12A-75LB47RM045 45mA at 60℃±2℃ 110mA at 25℃±2℃ 47±20%
WMZ12A-75LB33RM050 50mA at 60℃±2℃ 125mA at 25℃±2℃ 33±20%
 

 

Keywords:WMZ12A PTC thermistor

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