In most procurement cycles, MJA3BK is considered with GIC Temperature Controller, GIC Mj83Bk and GIC Timers Dt Series, giving decision-makers confidence that they’ve chosen the most dependable component.
GIC MJA3BK Temperature Monitoring
The GIC MJA3BK Temperature Monitoring offers 24 VAC/DC supply voltage, - 15 C to +60 C operating temperature, Base / DIN rail mounting, IP 20 for Terminals, IP 40 for Enclosure degree of protection. Manufactured by GIC under the GIC Temperature Monitoring category, this model belongs to the GIC MJ Series.
| Brand | GIC |
| Product Type | Temperature Monitoring |
| Model Number | MJA3BK |
GIC MJA3BK Temperature Monitoring – Technical Specifications
| Specification | Value |
|---|---|
| Supply Voltage | 24 VAC/DC |
| Supply Variation | -20% to + 10% |
| Supply Frequency | 50/60 Hz |
| Power Consumption(Max) | 2 VA |
| Trip Level | 2.7 kΩ, (± 5%) |
| Reset Level | 1.71kΩ (± 5%) |
| Sensor Short | <20Ω , (±4Ω ) |
| Hysterisis | 40Ω (±4Ω ) |
| Sensor Open | > 20kΩ (± 5%) |
| Max Cold Res( ) of Sensor Chain | < 1.5 kΩ |
| Reset Mode | Auto, Manual, Remote |
| Repeat Accuracy | 1% |
| ON Delay | < 350 ms |
| OFF Delay | 100 ms |
| Reset Time | 150 ms |
| Coil Output | 2 C/O |
| Contact Rating | 5A (Resistive) @ 250 VAC / 28 VDC |
| Electrical Life | 1 x 10^5 |
| Mechanical Life | 1 x 10^6 |
| Utilization Category AC - 15 | Rated Voltage (Ue): 120/240 V, Rated Current (Ie): 3.0/1.5 A |
| Utilization Category DC - 13 | Rated Voltage (Ue): 24/125/250 V, Rated Current (Ie): 2.0/0.22/0.1 A |
| Operating Temperature | - 15 C to +60 C |
| Storage Temperature | - 25 C to +80 C |
| Relative Humidity | 95% (Rh) |
| Degree of Protection | IP 20 for Terminals, IP 40 for Enclosure |
| Dimension (W x H x D) (in mm) | 22.5 X 83 X 100.5 |
| Enclosure | Flame Retardant UL94-V0 |
| Weight (unpacked) | 120 g |
| Mounting | Base / DIN rail |
The GIC MJA3BK Temperature Monitoring unit is engineered for dependable thermal protection in industrial automation. Operating on a 24 VAC/DC supply with a ±20% variation tolerance, it provides precise monitoring of winding and sensor resistance. The device incorporates a trip level of 2.7 kΩ, a reset level of 1.71 kΩ, and advanced detection for both shorted sensors under 20Ω and open sensors above 20kΩ. These features ensure that system faults are quickly identified before they cause serious damage. A selectable auto, manual, or remote reset mode allows engineers to adapt the relay to different operational needs.
Built with a flame-retardant UL94-V0 enclosure and IP20/IP40 protection ratings, the MJA3BK can withstand harsh industrial environments, high humidity up to 95% RH, and wide temperature variations from -15°C to +60°C. Its 2 C/O relay outputs, rated at 5A @ 250 VAC / 28 VDC, make it highly versatile for integration into alarms, shutdown systems, and other safety interlocks. With 1×10⁵ electrical operations and 1×10⁶ mechanical operations, this relay ensures long service life and consistent performance for critical applications.
Applications of the MJA3BK Temperature Monitoring include protection of motor windings, generator coils, industrial heaters, and power transformers. By continuously monitoring temperature-related resistance changes, it helps industries minimize downtime, prevent costly damage, and extend the lifespan of essential equipment. With GIC’s trusted engineering, this model delivers the accuracy and reliability demanded in modern industrial setups.
