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Current limiter
Current limiters, also known as inrush current limiters or power thermistors, are passive components designed to protect electrical circuits from high inrush currents during startup. These devices typically consist of NTC (Negative Temperature Coefficient) thermistors that exhibit high resistance at cold start, limiting the initial current surge...
Current limiters, also known as inrush current limiters or power thermistors, are passive components designed to protect electrical circuits from high inrush currents during startup. These devices typically consist of NTC (Negative Temperature Coefficient) thermistors that exhibit high resistance at cold start, limiting the initial current surge, and then decrease resistance as they heat up during normal operation. Key technical parameters include rated current (from a few amps to several tens of amps), maximum allowable energy absorption (in joules), and operating voltage range (typically up to 600V AC/DC). They are available in various disc sizes and lead configurations for through-hole mounting, with some models featuring PTC (Positive Temperature Coefficient) behavior for overcurrent protection. The selection depends on the load type, ambient temperature, and required suppression time.
Current limiters are essential in power supply circuits, motor drives, transformers, and lighting systems where high inrush currents can cause nuisance tripping of circuit breakers or damage to semiconductor components. They are commonly installed in switch-mode power supplies (SMPS), variable frequency drives (VFDs), UPS systems, and industrial battery chargers. In automation panels, they protect sensitive electronics in PLCs and control modules. They also find applications in HVAC systems, medical equipment, and telecommunications infrastructure where reliable startup is critical. The components are typically mounted on PCBs or in terminal blocks within distribution boards and control cabinets.
Subcategories include NTC inrush current limiters, PTC resettable fuses, and hybrid current limiting modules. Key article codes often follow a pattern like CL-XX-YYY, where XX indicates the diameter in mm (e.g., 05, 10, 20) and YYY represents the rated current in amps (e.g., 050 for 5A, 100 for 10A). Common series include the CL-20 series for 20mm discs handling up to 16A, and the CL-30 series for 30mm discs rated up to 30A. Other popular codes are MS-05-010 (5mm, 1A) and MS-10-050 (10mm, 5A). These are available in bulk packs or tape-and-reel for automated assembly.
At Electric Automation Network, we offer a comprehensive range of current limiters with real-time pricing and stock availability. Our engineering team provides personalized technical support to help you select the right component for your application, considering factors like energy rating and thermal management. We ensure express worldwide shipping, with most orders dispatched within 24 hours. Each product listing includes detailed datasheets and application notes to facilitate design-in. Whether you need standard NTC thermistors or specialized PTC devices, our multilingual portal simplifies procurement for global projects.
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