ERZ-E11E911

Varistor Voltage (Typ):	910V
Package / Case:	Disc 14mm
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Capacitance @ Frequency:	240pF @ 1kHz
Number of Circuits:	1
Energy:	255J
Current - Surge:	5kA
Varistor Voltage (Max):	1.001kV
Series:	ZNR®
Varistor Voltage (Min):	819V
Maximum DC Volts:	745V
Maximum AC Volts:	550V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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TVS - Varistors, MOVs

E11E911 varistors are widely used in multiple applications where they provide surge protection. They are designed to analyze the changing waveforms within a circuit and respond accordingly. Their primary function is to prevent over-voltage across an electrical circuit, which could cause permanent damage or short circuit.These devices are manufactured as packages of two or more components, which include a capacitor, a resistor, and a varistor. The varistor element consists of zinc oxide, which has high electrical conductivity when exposed to an electric field. As the applied voltage rises above the breakdown voltage, the current flows through the varistor and reduces the voltage to normal levels. Therefore, the varistor acts as a fast-acting surge arrester.When designing power-supply circuits with surge protection, engineers usually consider two types of varistors – metal oxide varistors (MOVs) and solid-state polymer varistors (SPVs). Each type of varistor is designed for different applications. MOVs require an additional capacitor and are more typically used for power-supply applications. On the other hand, SPVs consist of a more complex arrangement of capacitors, resistors, and switch assemblies and are employed in a broader variety of applications. Both types of varistors have the same protection across their entire range; however, an MOV is typically more cost-effective.One of the primary benefits of the E11E911 varistors is their frequency selectivity. This feature makes them ideal for protecting circuits from wideband noise and lightning strikes. The frequency selectivity is achieved by adding a capacitor between the varistor and the circuit to be protected. The capacitor acts as an extra filter and reduces the transmission of both high- and low-frequency components of the noise which otherwise might damage the components within the system.When exposed to over-voltage or large transients, the varistor begins to operate in avalanche breakdown mode. In this mode, the varistor absorbs the energy of the transient and produces a current clamped voltage. Once the transient has passed, the stored charge is discharged back into the circuit, allowing the device to return to the normal conducting mode.In order to provide the best protection, it is important to select the right varistor for the application. This can be a challenge in many cases, as the varistor must be capable of withstanding the voltage and surge conditions in the circuit. It is also important to remember that the applied voltage must not exceed the breakdown voltage of the varistor.In conclusion, E11E911 varistors offer an effective solution for surge protection in a wide variety of applications. They feature a unique frequency selectivity which allows them to effectively protect circuits from high- and low-frequency noise. Additionally, they are capable of current clamping when exposed to an over-voltage or transient, and they are both inexpensive and relatively easy to install in a variety of situations.

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