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

Long service life thanks to high-quality materials
High operating safety due to helium leak test for oil and gas tightness
Protective magnetic switches to prevent false triggering
Easy to service: Switch replacement possible without interfering with the oil circuit
100% retrofittable
Solid-body floats

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Product Information

Technical Data Downloads

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 66 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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MESSKO® MSAFE®

Your Advantages at a Glance

Product Information

Materials

Characteristic Data

Protected reed switch

Conection via Teminal Box

Mechanical tests

Materials

Characteristic Data

Protected reed switch

Conection via Teminal Box

Mechanical tests

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