MESSKO® MPREC®

Pressure relief devices for transformers and on-load tap-changers

The MESSKO® MPREC® pressure relief device protects distribution and power transformers, electric coils and tap changers reliably and safely in the event of sudden pressure increases. Special variants for directed oil flow and applications fulfill nearly all requirements in the offshore area or in wind turbines. When the defined response pressure (4 to 30 psi) is reached, the valve plates and signal pin lift and the main switching contacts are triggered within 2 milliseconds. The proven design and perfectly coordinated springs ensure that the pressure relief device closes again securely.

Your Advantages at a Glance

  1. Hood with interior micro-switches

  2. Opens within 2 ms; closes within 70 ms

  3. Suitable for wind turbines

  4. Defined valve stroke of approx. 4 mm up to forced activation of the main switching contacts

  5. Weatherproof aluminum signal pin with two notches, self-locking

  6. Steel springs in accordance with EN 10270-1-SH, plastic-coated, customer-specific part painting (KTL)

  7. Seawater-resistant hood

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Product Information

Technical data
Materials
Flange Seawater-resistant cast aluminum
Standard cover Seawater-resistant aluminum with RAL 7033 or RAL 7038 powder coating
Oil-directed cover Seawater-resistant cast aluminum with RAL 7033 or RAL 7038 powder coating
Corrosion protection In accordance with ISO 12944-9:2018, available in C4H or CX (optional)
Valve disk Rust-proof steel (1.4301)
Sealing material Perbunan (NBR) for mineral oils; optional fluorocarbon rubber FKM (Viton®) for alternative insulating media
Springs Spring steel in accordance with EN 10270-1-SH, plastic-coated customer-specific part painting (KTL)
Indicator pin Seawater-resistant aluminum, red (mineral oil) or blue (alternative coolant) anodized
Semaphore Stainless steel with RAL 1026 acrylic resin coating
Vent screw Stainless steel for oil bleeding in accordance with IEC 60076-22-1
Dimensions
Cover Ø 291 mm (Ø 11.46"), bolt circle Ø 235 mm (Ø 9.25"); 6 drilled holes each Ø 15.5 mm (Ø 0.61")
Installation height With standard cover: 234.5 mm (9.23") / with semaphore: 340 mm (13.39")
With oil-directed cover 246.5 mm (9.71") / with semaphore: 442 mm (13.46")
Weight With standard cover: approx. 6 kg (13 lbs.), with oil-directed cover: approx. 13 kg (29 lbs.)
Mounting gasket (optional) Ø 200 x Ø 178.5 x 4.25 (Ø 7.87" x Ø 7.03" x 0.17")
Operating Temperatures
Environment -50°C to + 80°C (mechanical); -40°C to +80°C (micro-switch)
Oil -30°C to +120°C
MICRO-SWITCHES
Number of switches Up to 2 switches, 1x NO each, 1x NC each; electrically isolated
Contact load As per IEC 60947-5-1: AC-15: 240 V / 3 A; 120 V / 6 A; DC-13: 250 V / 1.1 A; 125 V / 2.2 A
Max. continuous current 10 A
Rated insulation voltage AC: 2.5 kV/1 min.
Degree of protection IP65 or IP66
Connection designs Cable connection with 1x or 2x M20x1.5 cable glands
Terminal box with 1x or 2x M25x1.5 cable glands
ANSI connector with 16 AWG, SOOW cable; available in various lengths

 

Type LMPRD 04 LMPRD 06 LMPRD 08 LMPRD 10 LMPRD 12 LMPRD 15 LMPRD 20 LMPRD 25 LMPRD 30
PSI 4 PSI ± 1 6 PSI ± 1 8 PSI ± 1 10 PSI ± 1 12 PSI ± 1 15 PSI ± 1 20 PSI ± 1 25 PSI ± 1 30 PSI ± 1
Bar 0.28 bar 0.41 bar 0.55 bar 0.69 bar 0.83 bar 1.03 bar 1.38 bar 1.72 bar 2.07 bar
kPa 28 kPa 41 kPa 55 kPa 69 kPa 83 kPa 103 kPa 138 kPa 172 kPa 207 kPa

 

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