Thermally Protected Varistors
World Products, LLC. TVZ series is a two or three-leaded Thermally Protected Metal Oxide Varistor
One lead of the TVZ varistor is connected to a thermal fuse which is designed to open when the varistor is under sustained abnormal over-voltage conditions. The TVZ series is designed to meet the abnormal over-voltage requirements of UL 1449 3rd edition, Section 39.4.
Traditional Metal Oxide Varistors withstand 150% of its rated voltage for a given duration. But Metal Oxide Varistors may fail to a short-circuit condition or fail to open when subjected to sustained steady-state over-voltage above its rated specifications. TVZ has a thermal fuse integrated with an MOV disk that responds to the MOV temperature and disconnects the MOV from the line, should the temperature or voltage exceed a certain level.
World Products, LLC. three-leaded device is designed to be connected, via the monitor lead, to an indicator (such as an LED) to provide diagnostic features indicating if the MOV is disconnected from the circuit in the event the fuse element opens.
As a result of the integration of the thermal fuse attached to the MOV disc, Thermally Fused Varistors provide an instant response to unexpected over-voltage situations. Lower inductance is another benefit of the inclusion of a thermal fuse, enhancing clamping performance to sudden over-voltage transients. World Products, LLC. Thermally Protected Varistors offer protection to sensitive downstream electric components.
Additionally, TVZ varistors are wave solderable which simplifies end product assembly by reducing the expense and rework associated with hand soldering operations.
Proper design of surge protective devices (SPD's) require that they meet new UL 1449 3rd Edition requirements for abnormal over-voltage limited current. Fuses that are meant to protect the system for large fault currents do not address the need to protect against low fault currents. These low fault currents can result in catastrophic failure prior to tripping the higher current fuse. TVZ series varistors can meet the needs of the SPD designer, avoiding having to create a complicated/higher cost approach.
The thermo link in a thermo-fuse varistor should never be used in series with the load. It is only used to provide protection to the varistor portion in case of an abnormal over-voltage condition.
 Features
- RoHS compliant types available.
- UL1449, UL1414 and CUL recognition or pending status.
- Patented product (Patent #6636403).
- Low Leakage Current under normal operating voltage.
- UL1449 3rd edition abnormal over-voltage test (10A, 5A, 2.5A, 0.5A and 0.125A) recognition pending.
- Wave solderable.
- High Surge Current Rating up to 40kA.
- 55°C to 85°C Operating Temperature Range.
- Three leaded versions available, with fuses located on either the third or second lead.
- Compliance with Accelerated Aging Test Requirements per ANSI/IEEE C62.11 pending.
- UL60691 recognition pending.
- ISO and TS16949 certification.
Applications
- Transient Voltage Surge Suppressor (TVSS) Products
- AC Panel Protection Modules
- AC Line Power Supplies
- Surge Protected Strip
- AC Power Meters
- Uninterruptable Power Supply
- White Goods
- Inverters
- DIN Rail
- AC/DC Power Supplies
Approvals
|
|
14mm |
18mm |
20mm |
25mm |
34mm |
UL and CUL 1449
Third Edition (includes UL60691)
File # E321567 |
Pending |
Pending |
Pending |
Standard Series 130VAC
through 195VAC only.
Other values pending. |
Pending |
UL and CUL 1449
Second Edition
File #E196885 |
RoHS Series Only |
RoHS Series Only |
RoHS Series Only |
RoHS Series Only* |
RoHS Series Only |
UL and CUL1414
File # E71602 |
√ |
√ |
√ |
√ |
√ |
| VDE IEC-CECC spec |
Pending |
Pending |
Pending |
Pending |
Pending |
*with exception of 750VAC rated part.
Part Marking
| TVZ |
14 |
EB |
N |
241 |
K |
| ——— |
—— |
— |
— |
——— |
— |
| (1) |
(2) |
(3) |
(4) |
(5) |
(6) |
| (1) |
T = TVZ Series
|
 |
| (2) |
Disc Diameter
14: 14mm
18: 18mm
20: 20mm
25: 25mm
34: 34mm
|
| (3) |
Type
DB: 25mm Disc Size (Two Leads)
D: 25mm Disc Size (3 Leads)
EB: 14mm, 18mm & 20mm Disc Size (2 Leads)
EC: 14mm, 18mm & 20 mm Disc Size (3 Leads)
RB: 34mm Disc Size (Two Leads)
RC: 34mm Disc Size (3 Leads)
|
| (4) |
N = RoHS Compliant Series
|
| (5) |
Varistor Voltage/AC Voltage
241 = 24 x 101 = 240
|
| (6) |
Tolerance
K: ±10% |
Date Code
740 = First digit represents year (7 = 2007). Second and third digits represent the week of the year.
NOTE: Parts will be marked SINCERA. (This is the brand name.)
Part Number System
| TVZ |
20 |
E |
B |
N |
241 |
K |
B |
S |
| ——— |
—— |
— |
— |
— |
——— |
— |
— |
— |
| (1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
9) |
| (1) |
Thermal Fuse Metal Oxide Varistor
|
| (2) |
Diameter
14: 14mm
18: 18mm
20: 20mm
25: 25mm
34: 34mm
|
| (3) |
Energy Rating
D: 25mm
E: 14mm, 18mm & 20mm
R: 34mm
|
| (4) |
Fuse Location
Blank: 3-Leaded, Fuse Located on Third Lead (Available in 25mm)
B: 2-Leaded, No Monitor Lead
(Available in 14mm, 18mm, 20mm, 25mm & 34mm)
C: 3-Leaded, Fuse Located on Second Lead
(Available in 14mm, 18mm, 20mm & 34mm)
|
| (5) |
N: RoHS Compliant Series
|
| (6) |
Varistor Voltage/AC Voltage
Varistor Voltage for 14, 18, 20, & 25mm, 201 = 20 x 101 = 200VDC
AC Voltage for 34mm, 151 = 150VAC
|
| (7) |
Tolerance
K: ±10% |
|
| (8) |
Packaging
B: Bulk
For taped and lead configuration of taped parts, see taping specifications for suffix codes.
|
| (9) |
Lead Configuration for Bulk Parts Only
S: For 34mm series denotes Standard Lead.
S:Straight (For varistor voltage ≤681K), and in-line crimped (for varistor voltage >681K) for 14, 18, 20 & 25mm series.
L: Inline crimped (For varistor voltage <681K)
N:Varistor voltage >681 come standard with in-line crimp (see illustration below) for straight disc seating on PC boards. If straight leads are required instead of in-line crimp please use code “N” in this position, for 14, 18, 20 & 25 mm series.
*NOTE: For 3 leaded 14mm, 18mm, and 20mm types with in-line crimp, monitor lead is straight. For 25mm types monitor lead is in-line crimped.
|
| (9) |
Suffix for Custom Types
X33: Alternative Design with 3mm Monitor Terminal (34mm only). See Fuse Configuration & Dimensions for 34mm for more information. |
|
Absolute Maximum Ratings
| Continuous RMS Current (Monitor Lead) |
100mA |
| Typical Response Time |
<15n seconds |
| Insulation Resistance |
>1000MΩ |
| Hi-Pot Encapsulation |
2500 VDC |
| Maximum Voltage-Temperature Coefficient |
<0.01%/°C |
| Operating Temperature Range |
-55°C to 85°C |
| Storage Temperature Range |
-55°C to 125°C |
| Isolation Capability (when thermal element is open) |
600VAC |
NOTE: Stresses above those stated in Absolute Maximum Ratings may cause permanent damage to the device. These are stress only ratings and operation of the device at these or other conditions exceeding these ratings is not implied.
Soldering Profile
Back to TVZ
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