10D511K - 510V 10mm MOV Varistor Surge Protector | TYEE
MPN: 10D511K β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.06 | $0.06 |
| 10 | $0.055 | $0.55 |
| 100 | $0.049 | $4.90 |
| 500 | $0.044 | $22.00 |
| 1,000 | $0.039 | $39.00 |
10D511K Overview
A metal oxide varistor is a voltage-dependent, nonlinear resistor built from sintered zinc oxide grains with metal oxide additives. In the power-management hierarchy of circuit protection devices, the MOV sits alongside TVS diodes, gas discharge tubes, and fuses: it is a voltage regulator of sorts for transients, clamping surges by dropping sharply in resistance above its breakdown threshold. MOVs absorb the bulk of surge energy in AC line applications, typically working with downstream fuses, GDTs, and TVS devices in a coordinated protection scheme.
Key features of the 10D511K include a 459 V to 561 V varistor voltage window at 1 mA, an 845 V maximum clamping voltage at rated surge current, a single-pulse energy rating of 69 J, and a peak surge current class of 2.5 kA for an 8/20 us waveform. Its 10 mm disc size balances energy absorption capability against footprint, and a typical capacitance of about 70 pF makes it suitable for 50/60 Hz AC line use without significant loading.
The device follows the industry-standard 10D511K naming convention: 10 = 10 mm disc diameter, D = disc, 511 = 510 V varistor voltage, K = +/-10% tolerance. The zinc-oxide ceramic grain structure gives it a V-I curve resembling back-to-back Zener diodes, enabling bidirectional clamping of both positive and negative transients on AC lines. Degradation occurs gradually after repeated surge exposure, so designs should follow derating and failure-mode guidelines from the manufacturer datasheet.
Typical applications include AC mains input protection in switch-mode power supplies, industrial control panels, home appliances, LED drivers, telecom power front ends, and surge-protected outlets, where the MOV clamps lightning-induced and switching transients before they reach downstream electronics.
For design, always place a fuse upstream of the MOV: at end of life an MOV can fail short and overheat, so an agreed disconnection method is mandatory per safety practice.
This page synthesizes distributor pricing, cross-brand drop-in alternatives, and practical design notes not found in any single manufacturer datasheet.
Drop-in alternatives for 10D511K β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
MOV-10D511K
β Drop-Inπ Reference alternative (not in catalog)
VDR-10D511K
β Drop-Inπ Reference alternative (not in catalog)
S10K320
β Drop-Inπ Reference alternative (not in catalog)
V320LA10P
β Drop-Inπ Reference alternative (not in catalog)
TVR10D511
β Drop-Inπ Reference alternative (not in catalog)
HEL-10D511K
β Drop-Inπ Reference alternative (not in catalog)
10D511K Specifications
| Varistor Voltage @ 1 mA | 510 V (459 V to 561 V range) |
| Maximum Clamping Voltage | 845 V |
| Max AC Voltage (r.m.s.) | 320 V |
| Max DC Voltage | 415 V |
| Peak Surge Current (8/20 us, one time) | 2.5 kA |
| Single-Pulse Energy Rating | 69 J |
| Typical Capacitance | 70 pF |
| Circuit Configuration | 1 circuit |
| Package Type | Radial leaded disc, 10 mm diameter, through hole |
| Tolerance Code | K (+/-10%) |
| Mounting Type | Through Hole |
| Number of Leads | 2 (radial) |
| Product Series | 10D (10 mm MOV series) |
10D511K Pin Configuration
| Pin 1 | Terminal 1 β Varistor terminal - connect to line side (non-polarized, either lead) |
| Pin 2 | Terminal 2 β Varistor terminal - connect to neutral/opposite side (non-polarized, either lead) |
Typical Applications
10D511K is suitable for 6 applications: AC Mains Input Protection in SMPS, Industrial Control Panels and PLC I/O, LED Driver and Lighting Surge Protection, Surge-Protected Power Strips and Appliances, Telecom and Network Power Front Ends, Solar Inverter and Renewable Energy AC Output Protection.
AC Mains Input Protection in SMPS
The 10D511K is the classic first-stage protection element at the AC input of switch-mode power supplies. Its 320 V r.m.s. continuous rating withstands 230 VAC nominal lines plus tolerance, while its 510 V varistor voltage keeps leakage negligible during normal operation. Lightning-induced and switching transients on the line, typically modeled as 1.2/50 us or 8/20 us impulses per IEC 61000-4-5, are absorbed by the MOV's 69 J energy capability and 2.5 kA peak surge current rating before reaching the rectifier bridge and bulk capacitors. A series flameproof fuse is mandatory, since MOVs fail short at end of life. Placed directly after the input connector and before the X-capacitors, the 10D511K clamps residual line surges to 845 V maximum, protecting downstream electrolytic capacitors and the PWM controller from overvoltage stress.
Recommended
Industrial Control Panels and PLC I/O
Industrial environments expose control electronics to repeated switching transients from contactors, motors, and solenoids on shared AC or 24 V-derived buses. The 10D511K's 415 V DC rating makes it usable across rectified 230 VAC DC link rails, and its 2.5 kA single-pulse capability absorbs inductive kickback events that would destroy logic-level components. Mounted on terminal-block input boards or across relay coils' supply rails, the MOV clamps spikes before they couple into PLC analog inputs or communication interfaces. Because industrial panels face frequent rather than extreme surges, designers should monitor the MOV's derating: the 10 mm disc absorbs moderate energy per event but repeated hits near the 69 J limit degrade the zinc oxide structure. For harsher sites, upsize to 14D or 20D variants; for standard factory-floor AC distribution, the 10D511K provides an economical, proven layer of protection alongside GDTs and common-mode chokes.
Recommended
LED Driver and Lighting Surge Protection
Outdoor LED street lights and industrial luminaires sit directly on the AC grid and are highly exposed to lightning-induced surges, making the 10D511K a standard front-end component in LED driver designs. Its 320 VAC continuous rating covers 230 VAC lines, while the 510 V varistor voltage and 845 V maximum clamp shield the driver's electrolytic capacitors and switching MOSFETs from impulse energy that would otherwise cause premature field failures. The 10 mm disc's 69 J energy rating typically meets the differential-mode portions of IEC 61000-4-5 requirements for luminaire surge immunity; combined with a gas discharge tube in series for higher Class 3-4 sites, it forms a cost-effective hybrid protection stage. Because LED drivers run continuously for years, thermal derating and periodic MOV degradation should be considered in the MTBF calculation, and a fusible element upstream remains essential for end-of-life safety.
Recommended
Surge-Protected Power Strips and Appliances
Consumer appliances, white goods, and surge-protected power strips embed 10 mm MOVs like the 10D511K behind the mains switch to protect control electronics from line transients. The part's through-hole radial disc format suits cost-driven, hand-soldered or wave-soldered consumer boards, and at roughly four US cents in volume it is one of the cheapest protection elements available. Its 510 V varistor voltage keeps standby leakage current in the microamp range, which matters for energy-efficiency regulations on appliances with always-on standby modes. In multi-outlet strips, one 10D511K per outlet plus line-to-neutral and line-to-ground configurations provides both differential and common-mode transient clamping. Designers must include thermal fusing or an approved enclosure strategy, since a failed-short MOV in an unattended consumer product is a documented fire hazard; indicator circuits that flag MOV end-of-life are a common premium feature.
Recommended
Telecom and Network Power Front Ends
Telecom rectifiers, routers, and outdoor network equipment powered from AC mains or rectified DC buses use the 10D511K on the primary side to absorb surges coupled into long power runs. The 415 V DC continuous rating accommodates rectified 230 VAC DC-link rails, and the 70 pF typical capacitance is negligible at power frequencies, so the MOV introduces no meaningful loading on 50/60 Hz lines. In combination with series gas discharge tubes and common-mode chokes, the 10D511K handles differential-mode impulse energy per GR-1089 and IEC 61000-4-5 style requirements for network equipment. The 10 mm disc's 2.5 kA peak capability suits indoor and sheltered equipment; pole-mounted or subscriber-side hardware facing direct lightning exposure should escalate to 14 mm or 20 mm discs or add a two-stage GDT-MOV cascade, using the 10D511K as the fine-protection stage closest to sensitive power conversion circuitry.
Recommended
Solar Inverter and Renewable Energy AC Output Protection
Grid-tied solar micro-inverters, string inverters, and EV charger boards place MOVs on both the AC grid connection and the DC side. On the AC output of residential solar equipment, the 10D511K's 320 VAC / 415 VDC ratings and 510 V breakdown protect against grid switching transients and induced lightning that travel from the utility service entrance into the inverter. Its through-hole disc format survives the vibration and thermal cycling of outdoor enclosures better than some surface-mount alternatives, and the zinc-oxide construction tolerates the elevated ambient temperatures inside sealed enclosures when properly derated. Because solar installations are unattended for decades, reputable designs pair the 10D511K with thermal disconnect elements and specify premium certified variants such as the Bourns MOV-10D511K for compliance documentation. For the DC side at higher potentials, higher-voltage 10D or 14D family parts (e.g., 10D821K class) are selected instead, keeping the 10D511K for the AC port.
Recommended
Recommended Products Summary
Engineering reference data for 10D511K β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MOV-10D511K | VDR-10D511K | S10K320 | V320LA10P | TVR10D511 |
|---|---|---|---|---|---|---|
| Package | Radial disc 10 mm, through hole | Radial disc 10 mm - same | Radial disc 10 mm - same | Radial disc 10 mm - same | Radial disc 10 mm - same | Radial disc 10 mm - same |
| Brand | TYEE Products Inc | Bourns | VDR | TDK | Littelfuse | Thinki Semiconductor |
| Max Continuous AC Voltage | 320 V r.m.s. | 320 V r.m.s. | 320 V class | 320 V r.m.s. | 320 V r.m.s. | 320 V class |
| Max Clamping Voltage | 845 V | 845 V | 845 V | 845 V class | 845 V class | 845 V class |
Key Differentiators
- Lowest cost per joule in the protection BOM (vs MOV-10D511K)
- Immediate availability across multiple brands (vs VDR-10D511K)
- Trade-off: no integrated thermal disconnect (vs MOV-10D511K)
Design Notes
Always place a fuse or thermal disconnect in series with the 10D511K on the AC line. MOVs degrade with each surge and ultimately fail in a short-circuit mode; without upstream disconnection the failed varistor can overheat and ignite. This is the leading cause of MOV-related field failures in power supplies and power strips. For products subject to safety certification, use a flameproof fuse rated to clear the available fault current before the varistor disc exceeds its temperature limits.
Keep MOV leads short and mount the disc close to the point where the line enters the board. Long leads add inductance (roughly 1 nH per mm), which increases the clamped voltage spike during fast transients: at a 1 kA/us di/dt, even 20 nH of lead inductance adds an estimated 20 V of overshoot. Solder joints should support the full lead cross-section, and the disc must have clearance from adjacent components since MOV discs can reach high surface temperatures during large surge events.
Respect the continuous voltage derating: never operate the 10D511K above 320 V r.m.s. AC or 415 V DC continuously, and account for line tolerance (230 VAC +10% = 253 VAC) plus transient conditions. Estimated: running an MOV at 85-90% of its max continuous rating is common practice to extend lifetime. For environments with frequent surge exposure, derate the surge current to well below the 2.5 kA one-time rating and consider periodic replacement intervals or condition-monitoring circuitry that detects increased leakage current.
Compliance Information
Compliance data was not explicitly stated in the verified web data for the generic 10D511K. Consult the TYEE datasheet or select the Bourns MOV-10D511K for documented RoHS compliance statements.
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