TB 1574 Thermostatic Bimetal Strip Medium Sensitivity 0.10-2.00mm for Circuit Breaker Thermal Overload Relay
The TB 1574 thermostatic bimetal strip is Huona's flagship general-purpose grade, offering an optimal balance of thermal sensitivity, electrical resistivity, and mechanical strength. Composed of a high-expansion Mn-Ni-Cu alloy layer bonded to a Ni36Fe Invar low-expansion layer, this grade has become the industry standard for a broad spectrum of thermal actuation and protection applications. With decades of proven field reliability, TB 1574 is the go-to choice for high-volume circuit breaker and thermal relay manufacturers worldwide.
- Balanced Performance: Specific thermal deflection of 15.0 × 10⁻⁶/°C combined with 74 μΩ·cm resistivity provides an ideal balance between mechanical responsiveness and electrical characteristics.
- Proven Reliability: Trusted by major electrical component manufacturers globally for consistent performance across millions of thermal cycles.
- Cost-Effective: Optimized alloy composition using readily available raw materials ensures competitive pricing without compromising quality.
- Broad Application Window: Linear temperature range from -20°C to 200°C with maximum intermittent exposure up to 300°C.
- Excellent Formability: Medium hardness (260-330 HV) allows easy stamping, bending, and forming into complex shapes without cracking.
- Uniform Thickness Tolerance: Precision cold-rolling ensures thickness tolerance within ±0.005 mm for consistent deflection behavior.
- Flexible Supply Options: Available as continuous coil, precision-cut strip, blanked discs, or finished stamped components.
| Grade | TB 1574 |
|---|---|
| Specific Thermal Deflection (20-130°C) | 15.0 ± 5% × 10⁻⁶/°C |
| Resistivity (20°C) | 74 ± 5% μΩ·cm |
| Elastic Modulus (E) | ≥ 140 GPa |
| Density | 7.8 g/cm³ |
| Linear Temperature Range | -20°C to 200°C |
| Max Operating Temperature | 300°C |
| Hardness (HV) - High Expansion Side | 260 - 330 |
| Thickness Range | 0.10 mm - 2.00 mm |
| Width Range | 5 mm - 300 mm |
| High Expansion Layer | Mn72Ni10Cu18 (Mn-Ni-Cu Alloy) |
| Low Expansion Layer | Ni36Fe (Invar Alloy) |
| Surface Condition | Bright / Polished / Pickled |
| Form Available | Strip, Coil, Sheet, Disc, Custom Stamped Parts |
- Miniature circuit breakers (MCB) and molded case circuit breakers (MCCB)
- Thermal overload relays for motor protection
- Fluorescent lamp starters and glow switches
- Room thermostats and HVAC temperature controls
- Electric water heater and coffee maker thermostats
- Automotive cooling fan thermal switches
- Battery pack over-temperature protection strips
- Time-delay relays and flasher units
As an ISO 9001:2015 certified manufacturer, Huona delivers TB 1574 bimetal strip with consistent quality that meets or exceeds international standards. Our vertically integrated production process—from alloy melting and hot rolling to precision cold rolling and slitting—enables strict quality control at every stage. Each production lot undergoes comprehensive testing including thermal deflection measurement, resistivity verification, and 100% visual inspection. With a monthly production capacity of 30,000 kg, we can support both small trial orders and high-volume production runs. Our engineering team provides complimentary technical consultation on material selection, stamping parameters, and heat treatment optimization. Contact Huona today for samples and competitive pricing.
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