Lovato PMA50. Single & three phase.

Lovato Electric

PMA50 Pump Protection Relays

Lovato PMA50. Max AC current & min cosφ, delayed trip. Phase loss & incorrect phase sequence, instantaneous trip. 1 relay output with 1 changeover contact. For single and three phase systems.

The Lovato PMA50 Pump Protection Relays are suitable for industrial circuit protection applications for single and three phase systems. The PMA50 relay provides circuit protection for pumps against dry running via detection of motor under-load and over-current.  Adjustable tripping parameters (shown below) ensure the PMA50 is a versatile solution that can be easily adapted to the end user’s needs.


General Characteristics:

– Pump protection relay against dry running, auxiliary AC power supply.
– Motor under-load and over-current control.
– Direct connection up to 16A max, or by current transformer (CT).
– Excellent tripping accuracy.
– Voltage control range: 80-660VAC.
– Current control range: 0.1-16A.
– Resetting and enabling consent input.
– 1 relay output, with 1 changeover contact (SPDT).
– Modular DIN 43880 housing, 3-module.
– IEC protection degree: IP40 on front (only when placed in IP40 enclosure or control board), IP20 at terminals.
– Adjustments:
• “Cosφ min”: Minimum cosφ threshold 0.1…0.99 (under-load/dry running).
• “I max”: Maximum (over) current threshold 10…100% Ie.
• “Trip delay”: Tripping time for minimum cosφ and maximum current tripping time 0.1…10s.
• “Inhibition time”: Tripping delay for external input or at power up 1…60s.
• “Aut. reset delay”: Automatic reset time OFF – 100min.
• “Mode”:
Rated current 5 or 16A.
Single or three phase.
External reset On or Off.


Order Code Rated Current Ie Auxiliary Supply Voltage Weight (kg)
PMA50A240 5 or 16A 220-240VAC 0.251
PMA50A415 5 or 16A 380-415VAC 0.251
PMA50A480 5 or 16A 440-480VAC 0.251


(Please see attached PDF’s for further information)