B40K250 EPCOS Inc, B40K250 Datasheet - Page 18

• Manufacturer Part Number: B40K250
• Description: VARISTOR BLOCK 250VRMS 40MM
• Manufacturer: EPCOS Inc
• Series: HighEr

Specifications of B40K250

• Varistor Voltage: 390V
• Current-surge: 40kA
• Number Of Circuits: 1
• Maximum Ac Volts: 250VAC
• Maximum Dc Volts: 320VDC
• Energy: 490J
• Package / Case: Chassis Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: B72240B 251K 1; B72240B0251K001; B72240B251K1

Cautions and warnings
General
1. EPCOS metal oxide varistors (SIOVs) are designed for specific applications and should not be
2. Ensure suitability of SIOVs through reliability testing during the design-in phase. SIOVs should
3. For applications of SIOVs in line-to-ground circuits based on various international and local
Storage
1. Store SIOVs only in original packaging. Do not open the package before storage.
2. Storage conditions in original packaging:
3. Avoid contamination of an SIOV’s surface during storage, handling and processing.
4. Avoid storage of SIOVs in harmful environments that can affect the function during long-term
5. The SIOV type series should be soldered within the time specified:
Handling
1. SIOVs must not be dropped.
2. Components must not be touched with bare hands. Gloves are recommended.
3. Avoid contamination of the surface of SIOV electrodes during handling, be careful of the sharp
Soldering (where applicable)
1. Use rosin-type flux or non-activated flux.
2. Insufficient preheating may cause ceramic cracks.
3. Rapid cooling by dipping in solvent is not recommended.
4. Complete removal of flux is recommended.
Please read Cautions and warnings and
Important notes at the end of this document.
Block varistors
HighE series
used for purposes not identified in our specifications, application notes and data books unless
otherwise agreed with EPCOS during the design-in-phase.
be evaluated taking into consideration worst-case conditions.
standards there are restrictions existing or additional safety measures required.
Storage temperature:
Relative humidity:
Dew precipitation:
operation (examples given under operation precautions).
SIOV-S, -Q, -LS
ETFV and SFS types
edge of SIOV electrodes.
<75% annual average,
Is to be avoided.
–25 °C … +45 °C
<95% on maximum 30 days a year.
24 months
12 months.
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11/07