Street Light SPD 2PIN TMOV Thermally Protected Metal Oxide Varistor 20mm 320VAC 10KA With Thermal Cutoff Built-in
Street Light SPD 2PIN TMOV Thermally Protected Metal Oxide Varistor 20mm 320VAC 10KA With Thermal Cutoff Built-in
Applications
• SPD Products
• AC Panel Protection Modules
• AC Line Power Supplies
• Surge Protected Strip Connectors
• AC Power Meters
• Relocatable AC Power Taps
• GFCI (Ground Fault Current Interupter)
• UPS (Uninterruptable Power Supply)
• White Goods
• Plug-in Street Light SPD
• AC/DC Power Supplies
Description
The TMOV and iTMOV varistors offer quick thermal response due to the close proximity of the integrated thermal element to the MOV body. The integrated configuration also offers lower inductance than most discrete solutions resulting in improved clamping performance to fast overvoltage transients.
The iTMOV varistor differs from the TMOV varistor by the inclusion of a third lead for the purpose of indicating that the MOV has been disconnected from the circuit. This lead facilitates connection to monitoring circuitry.
 |
 |
| Dmax | 25.0 |
d1 (±0.1) |
1.0 |
| H2 max | 29.0 | d2 (±0.1) | 1.0 |
| Tmax | 10.7 | Lead Wire | Tinning copper wire |
| Lmin | 15.0 |
Comply with |
ROHS Directive |
| W1 (±1.0) | 11.5 | Coating |
Blue insulated epoxy resin |
| e1 (max) | 5.6 | Unit weight | 8.3g |
Electrical Performances
| Electrical parameters | |||||||
| Varistor voltage (V1mA) | 459V | ~ | 510 V | ~ | 561V | ||
| Max. continuous operating voltage | Vrms: 320 V; | VDC: 410V | |||||
| Rated power | 1.0 W | ||||||
| Max. clamping voltage (8/20μs) | VC: 850V; | IC: 100A | |||||
| Surge current (1×8/20μs) | 10000 A | (8/20μs) | |||||
| Max. energy | 184 J | (2ms) | |||||
| Typical capacitance | 1050pF | (1KHz) | |||||
| Leakage current | ≦10μA | (75% of V1mA (DC)) | |||||
| Operating temperature | -40℃ ~ +85℃ | ||||||
| Storage temperature | -40℃ ~ +100℃ | ||||||
| Fuse temperature | 146℃ | ||||||
| Hand soldered temperature / Time | 265℃/3s | ||||||
| Packing | ■ | Bulk | 200pcs/bag | 800pcs/box | 1600pcs/carton |
| □ | Tape&Reel | ----pcs/reel | ------pcs/box | ------pcs/carton | |
| □ | Ammopack | ----pcs/bag | -------------------- | ------pcs/carton |
Features
• Designed to facilitate compliance to UL1449 for SPD products
• High peak surge current rating up to 10kA
• Wave solderable
• Standard lead form and spacing option
• -55°C to +85°C operating temp range
• Three-lead version available for indication purposes
Select the Right Varistors for Overvoltage Circuit Protection
Varistors, also called metal-oxide varistors (MOVs), are used to protect sensitive circuits from a variety of overvoltage conditions. Essentially, these voltage-dependent, nonlinear devices have electrical characteristics similar to back-to- back Zener diodes.
Step 1: To find the voltage rating of the MOV, allow for 20% headroom to account for voltage swell and power-supply tolerances: 24 V dc × 1.2 = 28.8 V dc. Given that no varistors have a voltage rating of exactly 28.8 V, check the datasheets for specifications for 31-V dc MOVs.
Step 2: To determine which MOV disc size to use, first identify the MOV series that minimally meet the 1000-A surge requirement. Inspecting the table above suggests a 20-mm MOV with a 31-V dc maximum continuous voltage rating (part number V20E25P) as a possible solution to meet the requirements.
Step 3: Use the pulse-rating curves (Fig. 2) in the same datasheet to determine pulse capabilities relative to the 40 pulses at the 1000-A requirement.
Step 4: Use the V-I curve (Fig. 3) in the MOV’s datasheet to verify that leak voltage will be less than the 300-V ceiling.
Protecting MOVs Against Thermal Runaway
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