UMT-W  Fail Safe Device
Fail Safe Device

Series: UMT-W

Surface Mount Fuse, 5.3 x 16 mm, Super-Time-Lag TT, 125 VAC / 125 VDC, Breaking Capacity ≤ 1000 A

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10 Variants


  • 5 rated currents from 5 A to 20 A
  • Square design: 5.3 x 16
  • Impermeable to potting compound used to achieve hermetic seal for use in intrinsically safe applications according to ATEx and IECEx requirements.

Unique Selling Proposition

  • Suitable as Fail Safe Device
  • Very high melting integral
  • Precisely defined melting times (min/max)


  • Avionics
  • Wire protection
  • Fail-Safe Applications
  • Suitable for motor drive applications with medium to long motor cables

Other versions on request

  • Different Up Screenings
  • Extensive Test Reports
  • Visual Inspection according MIL-PRF 55342

Application Note Primary Protection in Equipmentwith further information on increased   Pulse Strength and their test conditions according to international standards see   Impulse Withstand Voltage

Rated Voltage

125 VAC, 125 VDC

Rated current

5 - 20 A

Breaking Capacity

up to 1000 A


Super-Time-Lag TT



Admissible Ambient Temp.

-55 °C to 125 °C

Climatic Category

55/125/21 acc. to IEC 60068-1

Material: Housing


Material: Terminals

Ni/Sn-Plated Copper Alloy

Unit Weight

1.42 g

Storage Conditions

0 °C to 40 °C, max. 70% r.h.

Product Marking

Schurter_Prüfzeichen, Rated current, Voltage, Characteristic, Breaking Capacity, Approvals

Soldering Methods

Soldering Profile


JESD22-B102E, Method 1 

Resistance to Soldering Heat


Moisture Sensitivity Level

MSL 1, J-STD-020 

Moisture Resistance Test

MIL-STD-202, Method 106

Thermal Shock

MIL-STD-202, Method 107

Operational Life

MIL-STD-202, Method 108 Condition F

Load Humidity Test

MIL-STD-202, Method 103

Vibration, High Frequency

MIL-STD-202, Method 204 Condition C

Mechanical Shock

MIL-STD-202, Method 213 Condition C

Resistance to Solvents

MIL-STD-202, Method 215

Temperature Cycling

JESD22 Method JA-104 

Board Flex


Detailed information on product approvals, code requirements, usage instructions and detailed test conditions can be looked up in  Details about Approvals
SCHURTER products are designed for use in industrial environments. They have approvals from independent testing bodies according to national and international standards. Products with specific characteristics and requirements such as required in the automotive sector according to IATF 16949, medical technology according to ISO 13485 or in the aerospace industry can be offered exclusively with customer-specific, individual agreements by SCHURTER.


The approval mark is used by the testing authorities to certify compliance with the safety requirements placed on electronic products.

Approval Reference Type: UMT-W

Approval Logo Certificates Certification Body Description
Approval marks cURus UL UR File Number: E41599

Product standards

Product standards that are referenced

Organization Design Standard Description
Partners IEC_Certification_Body Designed according to IEC 60127-7 Miniature fuses - Part 7: Miniature fuse-links for special applications
Partners UL_Certification_Body Designed according to UL 248-14 Low voltage fuses - Part 14: Supplemental fuses

Application standards

Application standards where the product can be used

Organization Design Standard Description
Partners IEC_Certification_Body Suitable for applications acc. IEC/UL 62368-1 Audio/video, information and communication technology equipment - Part 1: Safety requirements


The product complies with following Guide Lines

Identification Details Initiator Description
Approval marks CE Selbsteklaration SCHURTER AG The CE marking declares that the product complies with the applicable requirements laid down in the harmonisation of Community legislation on its affixing in accordance with EU Regulation 765/2008.
Approval marks Zulassung_Symbol_UKCA SCHURTER AG The UKCA marking declares that the product complies with the applicable requirements laid down in the British Amendment of Regulation (EC) 765/2008.
Environment_Safety RoHS_Logo_color_CMYK_tif SCHURTER AG Directive RoHS 2011/65/EU, Amendment (EU) 2015/863
Environment_Safety China_RoHS_50_non_konform_eps SCHURTER AG The law SJ / T 11363-2006 (China RoHS) has been in force since 1 March 2007. It is similar to the EU directive RoHS.
Environment_Safety Halogenfree SCHURTER AG SCHURTER strives to offer our customers halogen free products.
Environment_Safety REACH SCHURTER AG On 1 June 2007, Regulation (EC) No 1907/2006 on the Registration, Evaluation, Authorization and Restriction of Chemicals 1 (abbreviated as "REACH") entered into force.


Dimension [mm]

Soldering pads

Derating Curves

Percentage of Rating [%]
Ambient Temperature [°C]

Pre-Arcing Time

Rated Current In 1.0 x In min. 2.5 x In min. 4.0 x In min. 4.0 x In max. 10.0 x In min. 10.0 x In max.
5 A - 20 A 4 h 3.5 s 600 ms 20 s 25 ms 1 s


Time in Seconds
Current in Amperes

Short Table of Variants UMT-W Open complete table UMT-W

Rated Current [A] Rated Voltage [VAC] Rated Voltage [VDC] Order Number

Variant Details

The link on the respective order number refers to a separat tab with specific detailed information .
This assures better readable information of the selected product.
Change to the tab All Products in order to show details of another variant.
This approach offers to use generic alias link to the product details:
www.schurter.xx/art/ [Order Number]
where the following variables are used:
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- [Order Number]

A=Most Popular

A=Most Popular

Most popular products have the following customer benefits:
- previously ordered by multiple customers
- generally in stock for immediate delivery
- early adoption or mature life cycle
Contact us for availability on other product variants, lead-times vary:
Contact-Form Availability for all products can be searched real-time. Enter part number and required quantity:
Stock Check SCHURTER

Free Sample

Free Sample

Please ask for free sample in order to check if the products meets your requirement for your application. Send your delivery adress and your specific requirements.

Distributor Stock Check

Distributor Stock Check

The following links refers to the inquiry form for distributors stock information of the selected products. It allows checking for the available amount and optionally to place an order at your selected partner.
The stock availability at the distributors may also be called up separately and the desired product manually entered.
Stock Check Distributor

5 125 125 3-122-712  A  ...
5 125 125 3-122-713 ...
7.5 125 125 3-122-714  A  ...
7.5 125 125 3-122-715 ...
10 125 125 3-122-716  A  ...
10 125 125 3-122-717 ...
15 125 125 3-122-718  A  ...
15 125 125 3-122-719 ...
20 125 125 3-122-720  A  ...
20 125 125 3-122-721 ...

Most Popular.

1) UL = 350 A @ 125 VAC / 350 A @ 125 VDC

1) Internal tests = 1'500 A @ 125 VAC with cos(φ) ≥ 0.75 / 1500 A @ 250 VDC with τ <0.3 ms

2) UL = 350 A @ 125 VAC / 350 A @ 125 VDC

2) Internal tests = 1'000 A @ 125 VAC with cos(φ) ≥ 0.75 / 500 A @ 125 VDC with τ <0.3 ms


All measurements are carried out on a test board according to IEC 60127 with the following tracks:

5 A:         Track width 5.0 mm, Cu layer 35 µm

6.3 A, 7.5 A: Track width 7.5 mm, Cu layer 70 µm

10 A: Track width 7.5 mm, Cu layer 140 µm

15 A, 20 A: Track width 10 mm, Cu layer 140 µm

Packaging Unit
acc. IEC 60286-3 Type 2a
100 pcs in ESD-plastic bag
1500 pcs. in tape [W: 24mm and P1: 8mm] on reel [A: 33cm]


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