3JT25-2 Hermetic Electromagnetic Relay

  • 3JT25-2 is an international 1 cubic inch series, permanent magnet drive structure, with the function and performance equivalent to the international level. It has the characteristics of small size, light weight and large switching power. It can be used for satellite equipment, spacecraft, rockets, missiles, aviation and other military equipment and ground equipment automatic control systems.


3JT25-2 Sealed Electromagnetic Relay

Environmental Characteristics

No. Parameter Environmental Specification
1 Quality Grade Ⓙ, G G grade with No environmental rating
IV Mounting style 3 Mounting style 2
2 Temperature Range (℃) -55~85 -65~125
3 Relative Humidity (40±2) ℃, 90%~95%
4 Low Pressure (kPa) 4.39
5 Sinusoidal Vibration (Hz) 10~2000 10~3000
(m/s2) 196 196 294
6 Random vibration (m/s2)2/Hz 20 20 40
7 Shock (m/s2) 735 980 1960
8 Constant Acceleration (m/s2) 735


Main Characteristics

Contact Arrangement 3PDT Operating Time (ms) ≤15
Coil Power (W) 3.01 Release Time (ms) ≤15
Leak Rate (Pa.cm3/s) ≤1×10-3 Load Ratings Resistive 25A,28V d.c.
Contact Resistance(Ω) Initial ≤0.05 Inductive 12A, 28V d.c., 30mH
After Life ≤0.10 Lamp 5A, 28V d.c.
Insulation Resistance (MΩ) Normal ≥500(500Vd.c.) Electric Motor 10A, 28V d.c.
High Temp./Humidity ≥50(500Vd.c.) Low level



Dielectric Strength (50Hz) Normal ≥1250
Low pressure ≥350 Life Time (Cycles) 5×104
Weight (g) ≤75 Overload rating Resistive, 50A, 28V d.c.
Failure rate


Electrical Specification (V d.c.)

Specification No. Coil Voltage 25℃ Overall Temperature Range
Normal Max Coil resistance

(1±10%) Ω

Operating Voltage (max) Release Voltage (min) Operating Voltage (max) Release Voltage (min)
028 28 29 260 13.5 2.3 20 1


Mounting Style C (2) Mounting Style B (3)
Note: Vibration sensitive direction: Vertical


Circuit Diagram Resistive Load Diagram


Order Mark

G grade product

Example: 3JT25-2-028-3 2 F (No environmental rating)

3JT25-2 028 3 2 F
Product No.   Coil voltage   Mounting style Lead form Transient suppression identifier (optional)


Example: 3JT25-2/IV 028 3 2 F (Environmental rating)

3JT25-2 / IV 028 3 2 F
Product No.   Environmental rating Coil voltage   Mounting style Lead form Transient suppression identifier (optional)

Detailed specification: Q/RYJ01170-2010