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Circuit Protection Components

Circuit protection includes components, devices, and modules, such as fuses, circuit breakers, isolators, and suppressors that passively or actively protect components, circuits, or systems from voltage/current overloads.
Arresters prevent damage to equipment by shunting overload voltages to ground. Brownout protectors prevent deliberate lowering of the line voltage by providing a voltage sensing system that maintains line voltage at preset acceptable value.
Circuit Breakers (67 Companies)
Circuit protection devices open a circuit automatically when the current exceeds a predetermined value. Once the fault is removed, the breaker can then be closed again by resetting a lever (either manually or automatically) to resume normal operation.
Protect against over current surge faults by limiting flow of high current during fault conditions. Devices do not require replacement after fault as they reset themselves, allowing circuit to resume normal operating conditions once power is removed.
Fused Resistors (26 Companies)
Resistors designed to protect a circuit against overload by opening when the current drain exceeds design limits.
A fuseholder box/panel is an enclosure that contains a number of fuses or fuses blocks which separate electrical feeds for various circuits.
Specially constructed fuseholders which have high shielding provisions and enhanced gasket placement by the fuse cap to reduce emission of RFI and EMI.
Fuses & Fuse Elements (57 Companies)
Usually a short piece of wire, or chemical compound, which melts and breaks the circuit when the current through it exceeds the rated value.
Fuses, Failure Indicating (23 Companies)
Failure indicating (blown) fuses detect equipment failure by alerting personnel through indication on fuse, an alarm, etc. In event of fuse breakage, failure indication allows personnel to address hazard before equipment is damaged.
Fuses, International (29 Companies)
Outside of North America many manufacturers use metric-sized (international) fuses. Usually these standard fuses are smaller than domestic type (ex. 5 x 20 mm), but have the same circuit protection specifications and carry SEMKO and VDE approvals.
Fuses, Surface Mount (20 Companies)
Discrete fuses which are packaged without leads and fastened directly to foil patterns. Used in space-constrained applications; such as, hand-held electronic devices, cell phones, digital cameras, DVD players, etc.
Fuses, Thermal (24 Companies)
A cutoff using a one-time fusible link that cannot be reset and must be replaced due to overheating failure. Found in heat-producing electrical appliances e.g. hair dryer, where fuse functions as safety device to disconnect current to heating element.
Electrical protection device that disconnects circuit when it detects a current unbalance between neutral and live conductor. Also known as appliance leakage current interrupter, ground fault circuit interrupter (GFCI), or residual current device (RCD).
Isolators, Line (19 Companies)
Used in applications where an isolated ground is necessary, especially in telecom devices. Also isolator provides excellent noise rejection at low frequencies, reduces ground loop or line interference. May use Faraday shield design for improved isolation.
Limiters, Current (40 Companies)
Prevents flow of current to a prescribed amount, independent of the voltage. Simplest limiters are fuses, circuit breakers, and resistors. In-rush current limiters have resistances that lower with temperature, limiting initial or cold inrush current.
Panels, Fuse (17 Companies)
A fuse panel is a metal plate on an enclosure that contains a number of fuses which may be readily viewed or accessed.
Made up of two conducting electrodes separated by a gap filled with air or similar gas. When design voltage is exceeded, sparks form to ionize the gas and diminish its resistance. Spark gaps protect equipment against surges and damaging outages.
Suppressors, Surge (113 Companies)
Surge Suppressors are designed to protect electrical devices from voltage spikes. Regulates the voltage supplied to device by either blocking the supply, or shortening the source to ground when the applied voltage exceeds the safe threshold.
Solid state discrete or modular components that respond to sudden overvoltage to protect electronic equipment and circuits. TVSs are the fastest-responding overvoltage protector and are designed to prevent voltage spikes from affecting electronics.
Gas discharge (or gas-filled) tubes are arrangements of gas electrodes within an insulated seal. Traditionally made of glass, but are effective when made from ceramic or glass-lined metal. The tubes ionize the gas with voltage to conduct electricity.
Two-electrode semiconductors used to protect electronic equipment against sudden or transient surges of power in an AC power line, or against voltage surges due to static or lightning.
eeTechBriefs – 15-Minute on-demand multimedia web casts covering the latest product developments.

3M™ Ultra Hard Metric (UHM) Fully Shielded 2 mm Hard Metric Socket Connectors are engineered to deliver more than 7 Gbps backplane performance for systems based on 2 mm hard-metric connectors. System design engineers working with 2 mm hard-metric-based designs, such as VME or CompactPCI®, can now dramatically increase overall system performance while preserving their existing investment.

3M and Avnet Electronics Marketing are hosting a brief Webcast that will explore the following topics:

• Backplane design challenges and solutions
• UHM features and benefits
• PICMG Standard 2.30 for the J2 connector
• New PICMG 2.30 system slot and peripheral cards
• Support for legacy 2 mm HM system designs

In less than 14 minutes, you’ll gain an understanding of how standard Compact PCI and VME 64x systems can now support multi-gigabit, high-speed serial IO protocols such as SAS, SATA, Rapid IO, PCI Express and Gigabit Ethernet without costly backplane redesigns or forklift upgrades.


The 3M™ 2 mm Shielded Controlled Impedance (SCI) Cable Assembly Development Kit allows engineers to quickly and cost-effectively assess, test and design a high-performance 2 mm SCI cable-to-board solution for applications that require the proven reliability of latch/eject connectors.

Join 3M’s Lindsay Powell for a brief Webcast that will demonstrate how the kit components can be used to test and characterize the signal integrity of 3M 2 mm SCI latch/eject headers and 3M 2 mm SCI coaxial and/or twin-axial cable assemblies.

Other discussion topics include:
• System overview
• SCI and coaxial connector comparison
• Development kit configurations and contents
• Key performance features and target applications

Don’t miss this opportunity to learn how to verify signal integrity, impedance matching and crosstalk performance for high-speed applications and how to design a superior coaxial or twin-axial high speed cable assembly.


Phoenix Contact and Sager Electronics invites you to join us for an exciting Webcast to discuss the COMBICON Power PC 5 Product Family. COMBICON Power PCB terminal blocks are designed to carry current loads of 16A to 125A.

Join Lyndsey Walling from Phoenix Contact for a brief Webcast discussing: 

      • Market Trends 
      • High Current Printed Circuit Board Technology 
      • Terminal Block Options
      • Contact Design
      • PC 5 Family Capabilities
      • Applications

Don’t miss this opportunity to learn how the flexibility of the COMBICON PC 5 Products meet the interconnect requirements of the power electronics industry.


As many design engineers know, there isn’t an easy way to upgrade an existing 2 mm hard metric backplane to multi-gigabit speeds without a costly redesign. So, what can equipment vendors do to help customers supercharge legacy backplane systems without undertaking disruptive forklift upgrades?

Join 3M’s Lindsay Powell for a brief Webcast discussing how 3M™ MetPak™ HSHM connectors can support speeds up to 5 Gbps while leveraging and extending the life of design investments. Discussion topics include:

• Product features
    — True signal density: 5-row to 63 signals per linear inch (25 lines per centimeter) 

    — Ultra-high performance
    — Industry standard for hard metric (IEC 61076-4-101)
• Key applications
   — Multi-gigabit VME and cPCI
   — Military-aerospace
   — Telecom
• Design tips and techniques

Don’t miss this opportunity to learn how 3M is providing designers with a cost-effective and pain-free path to higher speeds, low skew and low crosstalk.


ebm-papst Inc. introduces a revolutionary new fan line: the S-Force generation of compact fans. Ranging from 80 mm to 172 mm in size, these extraordinary air movers are the most powerful performance fans on the market! Be one of the first to discover how this new technology will impact various cooling applications. Join ebm-papst™s Mark Shiring as he discusses the range of S-Force products, performance specifications, targets markets and availability of this ground-breaking new family of fans.


Application Reference Materials – Free Literature Search - App Notes, Design Kits, Eval Boards, Reference Designs, and more. Submit a request for Literature.

Signal Transformer's new catalog details their extensive portfolio of custom and standard power transformers and high frequency magnetics. The 56-page literature features chassis mount and printed circuit mount transformers along with supplemental magnetics, chokes, auto transformers, and three-phase magnetics for the broadest range of applications:

  • Industrial Controls
  • Medical
  • Motion Control Power Supplies
  • Communications
  • HVAC Lighting
  • Security
  • Test And Measurement

Signal Transformer Inc.

516-239-5777
sales@signaltransformer.com

Comprehensive source of inductors, transformers and filters for power, RF, filter and data applications, including new values for 25 product families:

  • High performance chip and power inductors
  • Square air core inductors
  • Coupled inductors for SEPIC applications
  • Designer's kits
  • Order FREE SAMPLES on-line

Coilcraft

800-322-2645

  • Catalog features split-core and solid-core current transformers, potential transformers, electrical transducers for AC and DC applications
  • Signal conditioners, digital and analog panel and switchboard meters
  • Current relays/switches, shunts, shunt switches, shorting terminal blocks, multi-function power meters, and accessories

Flex-Core

614-889-6152
Columbus, OH 45235

Datasheet and App. Note on new DFC Flat Supercaps, the newest way to extend battery operation and lifespan in portable devices. Depending on application, boosts battery life by 3x. Excellent for pulse and variable demand power applications.

  • Only 3.9 mm thin!
  • Ultra-fast charge/discharge cycling
  • Low ESR; Max. 3A current pulses
  • RoHS, environmentally friendly -40°C to +70°C
  • Choose 0.007F to 0.7F; 2.1 to 12 WVDC
  • Long life...500,000 pulses

Illinois Capacitor

847-675-1760
Lincolnwood, IL 60712
sales@illcap.com

Complete Catalog with Expanded Test Data and Specifications of High Frequency and MOS FET Relay Solutions from Omron's Electronic Components Group

  • Wide range of Form and Function Options MOS FET Relays — Superior Performance and Accuracy, and new low LED trigger options
  • RF MEMS Switch - Exceptional high-frequency characteristics, 10GHz typical/8GHz rated (50 Ohm)
  • High Frequency and Low Signal Relays

Omron Electronic Components

847-882-2288
components@omron.com
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