SSJ8 series high-precision time relayDetailed product description：

Application of SSJ8 series high-precision time relay:

The SSJ8 series high-precision time relay is used as a delay control component in DC and AC circuits for power system relay protection, control circuits, or industrial control. Especially suitable for situations where high time measurement accuracy is required and the time difference is small.

Relay model name:




Working Principle:
This relay is a static digital time relay, composed of imported CMOS integrated circuits, using frequency division and counting principles to achieve delay. The standard clock pulse is generated by a quartz crystal oscillator.
Once the rated voltage is applied to the relay, the internal instantaneous relay will activate and output, causing the crystal to vibrate and generate clock pulses. After frequency division, the clock pulses will be counted by the counter. When the counted pulse number reaches the delay setting value, the trigger will flip and drive the relay to output.
The schematic diagram of the relay principle is shown in Figure 1:



Usage:
The action time setting consists of two independent sets of three position 8421 code dial switches, and its setting formula is: t=k × T (s) (where k is the setting coefficient and T is the setting number of the dial switch). For example, for SSJ8-21A, with a k value of 0.01, if T is set to 357, the setting time is 0.01 × 357=3.57 (s); If T is set to 009, then the setting time is 0.01 × 9=0.09 (s)

Technical parameters of SSJ8 series high-precision time relay:

6.1 Delay Range A:
0.04~9.99S level difference is 0.01SB:
The difference between 0.1 and 99.9S is 0.1S
C: The difference between 1 and 999S is 1S
D: The difference between 1 and 999M is 1M
E: The difference between 1 and 999H is 1H
6.2 Delay consistency under benchmark conditions:
a) When the delay is set to 0.04s~0.99s, the consistency is not greater than 3ms
b) When the delay setting is greater than or equal to 1s, the consistency is not greater than (0.1% setting value+3ms);
6.3 Delay setting error: Under benchmark conditions, the average error shall not exceed (0.1% of the setting value ± 3ms).
6.4 Return time: The relay return time shall not exceed 25ms.
6.5 Power consumption: At rated voltage, the power consumption of the relay shall not exceed 10W.
6.6 Contact performance: In a DC circuit with a voltage not exceeding 250V, a current not exceeding 1A, and a time constant of 5ms ± 0.75ms, the breaking capacity is 30W; in an AC circuit with a voltage not exceeding 250V, a current not exceeding 5A, and a power factor of COS φ=0.4 ± 0.1, the breaking capacity is 250VA. The electrical life of the relay is 10 ^ 4 times.
6.7 Dielectric Strength
Each conductive circuit of the relay should be able to withstand an AC test voltage of 2kV (effective value) and 50Hz between the exposed non charged metal parts and the casing, and there should be no insulation breakdown or flashover phenomenon after a 1-minute test. 6.5 The conductive terminals of the insulation resistance relay are connected together between the exposed non charged metal parts or the outer shell. The insulation resistance should be measured with a megohmmeter with an open circuit voltage of 500V, and the value should not be less than 300M Ω.

Wiring diagram behind the relay:




Relay external dimensions and opening dimensions:
See Figure 1 in the general structural system for the structure of 10;
See Figure 3 in the general structural system for the 20 structure;
See Figure 7 in the general structural system for the 30 structure.

Ordering instructions:
When placing an order, the relay model specifications, rated voltage, wiring method, and order quantity must be specified. If the user requests to supply in sliding contact mode, the relay can provide a set of delay contacts and a set of sliding contacts. If it is required to return immediately after the sliding contact is closed for a certain period of time, special instructions must be made when placing an order, and the duration of the sliding contact's closure must be specified.

SSJ8 series high-precision time relay（No image available）