MESSKO® MPREC®
Pressure relief device 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
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Hood with interior micro-switches
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Opens within 2 ms; closes within 70 ms
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Suitable for wind turbines
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Defined valve stroke of approx. 4 mm up to forced activation of the main switching contacts
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Weatherproof aluminum signal pin with two notches, self-locking
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Steel springs in accordance with EN 10270-1-SH, plastic-coated, customer-specific part painting (KTL)
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Seawater-resistant hood
Product Information
| Operating temperature | -40...+80 °C |
| Ambient air temperature | -50...+80 °C (mechanical version only) / -40 °C...+80 °C (version with microswitches) |
| Corrosion protection class | C4H, C5H and CX (Offshore) |
| Degree of protection | IP 65 or IP 66 |
| Switches | Up to 2 switches, 1 x NO each, 1 x NC each; electrically isolated |
| Measurement range | 4 to 30 PSI |
| Electric connection | 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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| Operating temperature | -40...+80 °C |
| Ambient air temperature | -50...+80 °C (mechanical version only) / -40 °C...+80 °C (version with microswitches) |
| Corrosion protection class | C4H, C5H and CX (Offshore) |
| Degree of protection | IP 65 or IP 66 |
| Switches | Up to 2 switches, 1 x NO each, 1 x NC each; electrically isolated |
| Measurement range | 4 to 30 PSI |
| Electric connection | 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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