ERZ-E11A241 Panasonic Varistor (Other) In Stock
ERZ-E11A241 is a Panasonic 11 mm disk ZNR metal oxide varistor (MOV) rated at 240 V AC (385 V DC) for surge absorption in AC mains protection circuits. It provides transient overvoltage clamping up to several kA peak surge current with fast response times, protecting sensitive electronics from lightning and switching surges.
- Manufacturer
- Panasonic
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- ERZ-E11A241 Datasheet PDF
- Category
- Varistor
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 240 V AC (385 V DC) varistor voltage rating directly protects 120/240 V AC mains-connected equipment against transient overvoltages
- 11 mm disk body with high energy absorption capacity handles peak surge currents in the kA range for industrial-grade transient protection
- Metal oxide varistor (MOV) technology provides symmetrical bidirectional voltage clamping with sub-nanosecond response to voltage spikes
- ZNR series construction meets IEC 61643-11 surge protection device standards for AC power line transient voltage suppressors
- Bulk packaging option reduces per-unit cost for high-volume power supply and surge protector manufacturing applications
Applications
The ERZ-E11A241 is primarily used across AC line inputs of switching power supplies, motor drives, and appliance control boards to clamp transient overvoltages caused by lightning strikes, power line switching events, and inductive load switching that would otherwise damage downstream rectifier and filter circuits. Its 240 V AC varistor rating makes it the standard choice for 120 V/240 V dual-voltage global mains input stages where surge protection must function correctly at both nominal AC voltages without clamping during normal operation. The device is also used in industrial automation panels, residential circuit breakers with SPD functionality, and consumer electronics power adapters to meet IEC and UL surge immunity test requirements.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the varistor voltage of the ERZ-E11A241, and what AC mains voltage is it designed to protect?
The ERZ-E11A241 has a varistor voltage of approximately 385 V DC (corresponding to a 240 V AC RMS rating), positioning it as the correct choice for 120 V or 240 V AC mains protection where the peak AC voltage reaches 340 V and transient spikes can exceed 1 kV. The varistor begins conducting and clamping when voltage exceeds its 385 V threshold, diverting surge current away from protected components while remaining in a high-impedance state during normal 120 V or 240 V operation.
What peak surge current can the ERZ-E11A241 absorb, and how does the 11 mm body size relate to energy handling?
The ERZ-E11A241 11 mm disk varistor is rated for peak surge currents in the range of 4,500 A to 6,000 A for a standard 8/20 µs impulse waveform, with energy absorption capacity of approximately 40 J to 60 J per impulse. Larger disk diameters directly correlate to higher energy and current ratings because the varistor cross-sectional area determines how many parallel current paths are available; the 11 mm ERZ series provides substantially more surge handling than 7 mm or 5 mm varistors used in lower-power applications.
How fast does the ERZ-E11A241 respond to a transient voltage spike, and does it require any external driver circuit?
The ERZ-E11A241 responds to transient overvoltages in less than 1 ns, making it effectively instantaneous for protection against surge waveforms with rise times of 1 µs to 10 µs typical of lightning-induced transients and switching-induced surges on AC power lines. Unlike transient voltage suppressor (TVS) diodes which require careful power derating, the MOV requires no external driver or trigger circuit — it is a passive two-terminal device that self-clamps when the applied voltage exceeds the 385 V varistor threshold.
What standards compliance does the ERZ-E11A241 meet, and how does this affect its use in certified power supplies?
The Panasonic ERZ-E series varistors including the ERZ-E11A241 are designed to comply with IEC 61643-11 (surge protective devices for low-voltage distribution systems) and UL 1449 (standard for surge protective devices), which are the primary international certifications required for transient voltage surge suppressor (TVSS) components in power supplies seeking UL or CE marking. Using a certified MOV component in a power supply design simplifies the end-product certification process because the surge test immunity requirement at 4 kV (1.2/50 µs) and 2 kA (8/20 µs) defined in IEC 61000-4-5 can be met with a single 11 mm MOV placed across the AC input.
How does the ERZ-E11A241 degrade over time with repeated surge events, and when should it be replaced?
Metal oxide varistors including the ERZ-E11A241 experience gradual degradation with each surge event, as repeated high-current pulses reduce the varistor voltage threshold by approximately 10% after 1,000 impulses at rated peak current. In practice, a varistor that has clamped several large surges (greater than 1 kA each) may develop increased leakage current above 1 mA at rated operating voltage, generating excess heat and eventually leading to thermal runaway; this is why IEC 61643-11 requires an internal thermal disconnect fuse in production-grade surge protector assemblies to open the circuit before the degraded MOV reaches destructive temperatures.
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