MZ21 16P 50 Ohm Positive Temperature Coefficient Thermistor 18MM PTC Thermistor Resistance
Product Description:
MZ21 Type Thermistor used for overcurrent protection in telecommunication and AC circuit.
Function:PTC Thermistor Special for over current,overload protection of welding machines.
Technical parameters of Welding machine overload protection PTC Thermistor:
16P nominal R25 resistance: conventional 6 Ω, also 3.7 Ω, 5 Ω, 7 Ω, 10 Ω, 12 Ω, 15 Ω
Allow R25 resistance deviation: 100 Ω ± 30%, others: ± 25 %
Rated power: 0.5 W
Summary
16P PTC Thermistor used for overcurrent protection in telecommunication and AC circuit.
Structure and Dimensions
Shape and Dimension (unit :mm)
| Part no | DMAX | W±1.0 | TMAX | Φd±0.05 | ||||||||||||||||||||||||
| MZ21- P501RMN | 18.0 | 5.0 | 5.0 | 0.8 | ||||||||||||||||||||||||
Performance Specification
Part no |
rated resistance (25℃±1℃) | switch temperature (±7℃) | break down voltage Ac |
non-operating current (at 40℃) |
typical trip current | Operating ambient temperature range |
|||||||||||||||||||||||
| MZ21-P501RMN | 50Ω±20% | 120℃ | 300 V | 450 mA | 900 mA | -10~+45℃ | |||||||||||||||||||||||
How to Order 16P PTC Thermistor
① — PTC Thermistor
②
| Product style | ||||||||||||
| 2 | Current limited | |||||||||||
| 3 | Delay time | |||||||||||
③
| Product type | Sequence No. | |||||||||||||||
| 1 | 1.Coating type | |||||||||||||||
| 2.Plastic type | ||||||||||||||||
| 3.Empty body | ||||||||||||||||
| 3 | No mark | |||||||||||||||
④ — — switch temperature,P:120℃
⑤ — Ω(resistance value) 5＝5×10 0 ,
⑥ — ( OHM )
⑦ — — (Tolerance) K:±10%, M:±20%, N:±25%
⑧ — — (Diameter of Chip) N:Ф16mm
The 16P PTC Thermistor Characteristics Curve
Working Principle
When the circuit is in normal state, the current passing through the PTC thermistor is less than the rated current, and the PTC thermistor is normal and the resistance is small.Does not affect the normal operation of the protected circuit. When the circuit fails and the current greatly exceeds the rated current, the PTC thermistor suddenly heats up and is in a high resistance state. The circuit is disconnected to protect the circuit from damage. When the failure is eliminated, the PTC thermistor automatically returns to a low resistance state and the circuit returns to normal
operation.
Advantage
1.Automatic circuit protection,can resume steadily,
2.contactless,noiseless and flameless,
3.reacts fast,
4. with a better performance of overvoltage protection,
5.wide operating voltage range,
6.small steady resistance,
7.low rated current,
8.small resistance,small size,
9.stable for a long time,
10.no need to be reset supply after overload protection,
11.wide operating temperature range, 0 ~ +60°C (V=Vmax), -25 ~ +125°C (V=0),
12.RoHS compliant.
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