PEPI Thermal Protectors

Call us: 01606 871 680

PEPI thermal protectors from ATC Semitec offer superior and reliable over-temperature protection from 5°C to 200°C with current ratings up to 15A/250VAC. Their neat design small package sizes help to protect circuits in the tightest of spaces.

PEPI bi-metal protectors can be supplied as automatic-reset limiters, self-hold cut-outs or even one-shot fuses offering different levels of safety depending on what the application or approval standard requires. PEPI C and V thermostats are auto-resetting whereas the low-profile PEPI JS offers self-hold, non-resetting protection for both 240VAC and 120VAC.

PEPI J-2 and PEPI H bimetal fuses offer the ultimate in reliable thermal protection, with some ceramic versions offering over-temperature protection up to 280°C.

Call us today on 01606 871680 or complete the Contact us form to discuss your application’s thermal sensor requirements. Using our extensive technical knowledge and innovative supplier base, we will work with you to provide the optimum solution for your product.

Please also see our downloadable ‘how-to’ guide to thermal controls. Great advice including choosing optimum applications for working with bimetallic devices and tips on improving their performance.

PEPI C & CR Creep-Action Thermostats
PEPI C thermostats (or PEPI CR thermal switches) are universal, close-control bimetallic thermostats. With tight tolerances and slow-make/slow-break contacts, they achieve very close temperature control.
Factory calibrations from 5°C to 200°C in 1K steps
Available as normally-closed (PEPI C ) or normally-open (PEPI CR)
Gold-diffused contacts available for low-voltage/low-current loads
View Product Details
PEPI C Thermostats.pdf
PEPI V & VA Ultra Small Thermostats
Snap-action battery protectors in an ultra-thin, small plastic case. The PEPI V and PEPI VA devices offer overcharge, overload and/or short-circuit protection in rechargeable battery packs.
Calibrations: From 45°C to 100°C
Nickel straps for spot-welding
Suitable for DC applications
View Product Details
PEPI V-VA-Thermostats.pdf
PEPI H1 One-Shot Thermal Fuses
The PEPI H1 is the lowest-profile, one-shot bimetal thermal fuse offering superior ultimate thermal protection up to 240°C.
Miniature size: 18 x 7 x 5 mm
Temperature range: 160°C to 240°C
Fast thermal response
Rating 10A/250VAC
View Product Details
PEPI H1 - One shot Thermal Fuses.pdf
PEPI J2 Snap Action Bi-Metal Fuse
The PEPI J-2 is a snap action thermal fuse that functions as a non-resetting over-temperature control. This single operation device performs like a conventional thermal fuse but with the reliability of the sensing element being 100% tested first.
Temperature range: 70°C~160°C
Contact rating: 15A/120VAC
View Product Details
PEPI J2 Thermal Fuses.pdf

Why monitor battery temperatures?
Battery temperature is a key indicator of 3 major parameters of a battery pack: Safety, Performance, and Lifespan.
An effective Battery Management System (BMS) will include several temperature sensors to aid with identifying and regulating these parameters.
ATC Semitec have a range of products which can be used for battery temperature monitoring in a variety of locations and applications.
- External Pack sensors (for battery surface/busbar/terminals)
- Between Cell sensors
- In Cell sensors
For over-temperature protection, we offer a range of thermal cut-outs which will break the circuit at a predetermined temperature limit. These can be mounted on a battery pack or even between cells for rapid response.
- Battery protection cutouts
To explore this question in more depth click here
How do Current Regulating Diodes (CRDs) work?
CRDs (current regulating diodes) are diodes that maintain a constant current flow despite fluctuations in the voltage, over a wide range of voltage, from less than 1V to 100V.
Creating a constant current circuit generally involves multiple components. At ATC Semitec, we supply CRDs by Semitec, which provide the same function but as a single component.
This provides a concise, cost effective solution where space is limited.
Have a question or need a sample ? Call one of our engineers today on 01606 871680
When would you use Circuit Protectors?
Circuit protectors offer circuit protection in devices in a manner that is far superior to using fuses.
This makes them ideal for applications containing:
Relay circuits
Motors
Heaters
Transformers
Solenoids
Semiconductors
Our CRD‘s from Semitec have a wide range of operating voltages that they can steady current over, and their small size makes them a neat solution in tight spaces.
What are PTC Resettable Fuses?
PTC or Polymer PTC (PPTC) fuses carry current up to a threshold temperature. At this point, the crystalline polymer structure will change to an amorphous state, leading to a massive increase in resistance, preventing charge from being carried across the device.
The device will then remain in this high resistance state until the applied voltage is removed and they have cooled down, allowing the polymer structure inside to return to its original crystalline form. Hence, they are considered re-settable.
At ATC Semitec, we have a range of different PTC resettable fuses for use over many currents and operating temperatures.
To have a look at our current range of devices, click here.
Have a question or need a sample ? Call one of our engineers today on 01606 871680
What are the different types of Circuit Protection?
There are many different types of circuit protection devices due to the multiple different ways that current can be limited in a circuit. At ATC Semitec, we have a range of different circuit protects to suit your appliance.
From our repeat use Inrush Current Limiters from Thinking TKS, designed to protect front-end mains voltage supplies against current spikes at switch-on, to our SEFUSE Thermal Fuses from SCHOTT which offer one-shot ultimate thermal protection from 70°C to 240°C, our range can tailor to your requirements.
For more information, and to see our full range of devices, click here.
Have a question or need a sample ? Call one of our engineers today on 01606 871680
What are Circuit Protectors?
Circuit protection devices protect the circuit from excessive temperatures, currents or short circuit in an electrical conductor. They are essentially ‘weak links’ within the circuit that are designed to fail when a fault in the system is encountered. By breaking at low currents, they limit the amount of energy that is released during electrical failure, leading to safer devices.
From PTC resettable fuses, to CRDs, to MOV’s, we have an array of different devices to that can be implemented.
To see our full range of Circuit Protection Devices, click here.
Have a question or need a sample ? Call one of our engineers today on 01606 871680

Industrial Applications