MESSKO® MSAFE®

Buchholz relay – protection system MSAFE® for transformers

More than 100 years of experience went into the design of the rugged MESSKO® MSAFE® Buchholz relay. It reliably protects fluid-filled transformers and reactors with an expansion tank. The MR standard ensures maximum operating safety: Every device is subjected to a helium leak test. MESSKO® MSAFE® features integrated solid-body floats as well as protective magnetic switches and test buttons separated from the oil. Remote testing is possible via compressed air line. A wide range of flanges and an additional gas removal device are available for the device. An offshore version is also available.

Your Advantages at a Glance

  1. Long service life thanks to high-quality materials

  2. High operating safety due to helium leak test for oil and gas tightness

  3. Protective magnetic switches to prevent false triggering

  4. Easy to service: Switch replacement possible without interfering with the oil circuit

  5. 100% retrofittable

  6. Solid-body floats

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Product Information

Materials
Housing and upper part including terminal box Aluminium casting, RAL 7033 or 7038 (similar to ANSI 70 light grey), powder coated;
Offshore model on request
Inspection glass Tempered glass with UV filter
Characteristic Data
Installation Indoors and outdoors, tropical proof
Ambient temperature -50 - 80 °C
Isolation liquid temperature -30 - 120° C (mineral oil)
Protection mode IP 55 as per DIN EN 60 529
Nominal tube diameter DN25, DN50, DN80 or G 1 1/2“ threaded connection
Flap triggering pressure for DN25, DN50 and DN80 on customer request
0.65 m/s, 1 m/s, 1.5 m/s, 2 m/s or 2.5 m/s (each ±15%); others on request
Protected reed switch
Number and type Normally closed, normally open and / or changeover contacts on customer request; potential free; 2 pieces per function
Nominal voltage 24-250 V AC/DC
Max. nominal current 2 A AC/DC
Min. switching current 50 mA/24 V DC
Max. through current 3 A AC/DC
Max. switching capacity AC 1.2 VA-400 VA
Max. switching capacity DC 1.2 W-250 W
Rated insulation voltage 2.7 kV AC/2 sec. contacts against housing; 1 kV AC/2 sec. open contacts
Insulation resistance 1000 MΩ/500 V DC
Conection via Teminal Box
Connection terminals min. 0.25 mm2 / max. 4 mm2
Cable gland M25x1.5 for cable ø 13...20 mm or 1/2“ NPT
Mechanical tests
Vibration 5-35 Hz and 10-150 Hz at 2 g, 2 h (IEC 60068-2-6)
Earthquake 2-10 Hz, 22.5 mm, 1 h (IEC 60068-2-57)
Shock 10 g, 10 ms (IEC 60068-2-27)
Continuous oscillation test 100, 200, 300, 400 Hz, 1 g, 2 h
Technical Data
Materials
Housing and upper part including terminal box Aluminium casting, RAL 7033 or 7038 (similar to ANSI 70 light grey), powder coated;
Offshore model on request
Inspection glass Tempered glass with UV filter
Characteristic Data
Installation Indoors and outdoors, tropical proof
Ambient temperature -50 - 80 °C
Isolation liquid temperature -30 - 120° C (mineral oil)
Protection mode IP 55 as per DIN EN 60 529
Nominal tube diameter DN25, DN50, DN80 or G 1 1/2“ threaded connection
Flap triggering pressure for DN25, DN50 and DN80 on customer request
0.65 m/s, 1 m/s, 1.5 m/s, 2 m/s or 2.5 m/s (each ±15%); others on request
Protected reed switch
Number and type Normally closed, normally open and / or changeover contacts on customer request; potential free; 2 pieces per function
Nominal voltage 24-250 V AC/DC
Max. nominal current 2 A AC/DC
Min. switching current 50 mA/24 V DC
Max. through current 3 A AC/DC
Max. switching capacity AC 1.2 VA-400 VA
Max. switching capacity DC 1.2 W-250 W
Rated insulation voltage 2.7 kV AC/2 sec. contacts against housing; 1 kV AC/2 sec. open contacts
Insulation resistance 1000 MΩ/500 V DC
Conection via Teminal Box
Connection terminals min. 0.25 mm2 / max. 4 mm2
Cable gland M25x1.5 for cable ø 13...20 mm or 1/2“ NPT
Mechanical tests
Vibration 5-35 Hz and 10-150 Hz at 2 g, 2 h (IEC 60068-2-6)
Earthquake 2-10 Hz, 22.5 mm, 1 h (IEC 60068-2-57)
Shock 10 g, 10 ms (IEC 60068-2-27)
Continuous oscillation test 100, 200, 300, 400 Hz, 1 g, 2 h

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