1JS-7A Space & MIL-Spec Time Delay Relay

  • This product is a Type 1 (action delay) hybrid time delay relay. It has the characteristics of small size, wide application voltage range and resistance to harsh environmental conditions. The delay is stable within the specified temperature range and the accuracy is high. It is widely used in control systems of aerospace and ground equipment for time sequence control.

1JS-7A Hybrid Time Delay Relays

Environmental Characteristics

No. Item Environmental conditions
1 Quality Grade Military (Ⓙ) KJ
2 Ambient temperature -55℃ ~ 85℃ -55℃ ~ 105℃
3 Low air pressure 0.67 kPa~0.27 kPa
4 Relative humidity 40℃±2℃, 90%~95%
5 Sinusoidal Vibration 10 Hz~2000 Hz, 147m2/s
6 Random Vibration —– 25 (m/s2)2/Hz
7 Shock 490 m/s2, 11 ms
8 Constant acceleration 490 m/s2
Order mark RY4.546.005JT(Soldering seal)1JS-7A/28

RY4.546.053JT(Laser welding)1JS-7A/28

Note: The accuracy of the delay and the installation method should be stated when ordering.


J1513/RY20045-001 Y/1JS-7A

Note: The accuracy of the delay and the installation method should be stated when ordering.


Main Specifications

Delay type 1 (action delay) Life time 1×104 times
Rated operating voltage 28 Vd.c. KJ 1×105 times
Operating voltage range 22Vd.c.~ 30Vd.c. Output form DPDT
Input Current ≤100mA Contact resistance ≤0.1Ω Initial and ≤0.5Ω after life (tin seal)

≤0.05Ω Initial and ≤0.2Ω after life (laser welding)

Delay range 0.1s~70 s
Delay accuracy Military Class A:±2%

Class B:±5%

Class C:±8%

Insulation resistance

≥100MΩ, 250Vd.c. (Soldering seal)

≥500MΩ, 500Vd.c. (Laser welding)

KJ ±5% or ±10%(0.1s<T≤0.5s)

±2% or ±10%(0.5s<T≤70s)

Dielectric strength

250 Vr.m.s., 60s, 1mA (Soldering seal)

500 Vr.m.s., 60 s, 1 mA (Laser welding)

Recycling time 3 times of delay time, or not less than 3 seconds (take the big one) Weight ≤50 g
Specified load 28 Vd.c.,1A (Resistive) Dimensions 22.8mm×24mm×30mm
Leak rate ≤1×10-2 Pa.cm3/s (laser welding) Installation method B(3), C(2)


Mechanical drawings

Mechanical drawings Installation method C2 Mechanical drawings Installation method B3
Installation method: C (Installation method 2) Installation method: B (Installation method: 3)
Note: Vibration sensitive direction: Vertical


Timing Diagram

Timing Diagram

Note When using the product, short-circuit the 9,10 lead rods. If the delay is greater than 70 seconds, the external resistor can be used for adjustment.

Circuit drawing

Load characteristic graph

Circuit drawing Load characteristic graph


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