Protective microassemblies FOR-0, FOR-1. Reference data

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Protective microassemblies FOR-0, FOR-1. Reference data

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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Protective microassemblies are designed to reduce to a safe level high-voltage (amplitude 1 kV or more) pulses in household and industrial AC networks with a voltage of 220 V. In "Radio", 1998, No. 7, p. 52, 53 published an article by V. Kolosov and A. Muratov "Protection of electronic equipment from high-voltage pulses in the network", which discusses the principle of operation of semiconductor voltage limiters and microassemblies based on them, and application features.

Below are the characteristics of protective microassemblies produced by the domestic industry. At present, two of their series have been mastered - ZA-0 and ZA-1. Devices ZA-0 (Fig. 1) have wire leads and are designed to be built into the equipment, and ZA-1 are designed in the form of a plastic power plug (Fig. 2) with rigid pins for installation in a standard power outlet. Option ZA-01, described as an example in the mentioned article, was recognized as unpromising and discontinued.

Protective microassemblies ZA-0, ZA-1

Three LED indicators are displayed on the front side of the microassemblies. Medium - green glow - shines in the presence of mains voltage and with serviceable voltage limiters. "Red" LEDs (both or one of them) turn on when both or one limiter fails, respectively.

Technical characteristics of microassemblies ZA-0 and ZA-1 are summarized in Table 1.

Table 1

microassembly	impulse max. permissible power⁽¹⁾, kW	Opening voltage, V	Opening voltage spread, %	Maximum non-opening voltage⁽²⁾ , V, no more	Weight, g, no more
FOR-0-1,5-400A	1,5	400	5	320	10
ZA-0-1,5-400B			10
FOR-0-1,5-450A		450	5	360
ZA-0-1,5-450B			10
FOR-0-1,5-540A		540	5	430
ZA-0-1,5-540B			10
FOR-0-1,5-630A		630	5	500
ZA-0-1,5-630B			10
FOR-0-1,5-720A		720	5	580
ZA-0-1,5-720B			10
FOR-0-1,5-800A		800	5	640
ZA-0-1,5-800B			10
FOR-1-1,5-400A	1,5	400	5	320	30
ZA-1-1,5-400B			10
FOR-1-1,5-450A		450	5	360
ZA-1-1,5-450B			10
FOR-1-1,5-540A		540	5	430
ZA-1-1,5-540B			10
FOR-1-1,5-630A		630	5	500
ZA-1-1,5-630B			10
FOR-1-1,5-720A		720	5	580
ZA-1-1,5-720B			10
FOR-1-1,5-800A		800	5	640
ZA-1-1,5-800B			10

Notes

(1) With a pulse with a steep front with a duration of not more than 10 µs, decreasing when the amplitude value is reached exponentially; the pulse duration at a level of 0,5 of the amplitude is not more than 1 ms with a duty cycle of 10. With a rectangular pulse shape, the power is reduced by 000 times, and with a shape close to half-sinusoidal, by 2 times.

(2) The operating voltage amplitude should not exceed the maximum non-opening voltage.

Power consumed by microassemblies in the absence of high-voltage pulses in the network, not more than 0,5 W for devices ZA-0-1,5-400A, ZA-0-1,5-400B, ZA-01,5-450A, ZA-0 -1,5-450B and no more than 1 W for the rest. The light intensity of the LEDs is at least 0,5 mcd at an operating voltage of at least 0,8 of the maximum non-opening voltage.

The dependences of the pulsed maximum allowable power Rmp max on the pulse duration t and with the pulse shape "decreasing exponential" and various values of the duty cycle Kz are shown in fig. 3.

Protective microassemblies ZA-0, ZA-1

Dependence of the pulsed maximum allowable power Rimp max on the ambient temperature Tamb. cf for a rectangular pulse is shown in Fig. 4.

Protective microassemblies ZA-0, ZA-1

Author: R. Tolkacheva, Moscow

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