(19)
(11) EP 0 860 848 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.03.1999 Bulletin 1999/11

(43) Date of publication A2:
26.08.1998 Bulletin 1998/35

(21) Application number: 98200107.5

(22) Date of filing: 15.01.1998
(51) International Patent Classification (IPC)6: H01H 50/56, H01H 50/64
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 13.02.1997 IT MI970295

(71) Applicant: MTI S.r.l.
20122 Milano (IT)

(72) Inventors:
  • Baggi, Maurizio
    20060 Cassina De' Pecchi (Milan) (IT)
  • Ceriati, Federico
    20145 Milan (IT)

(74) Representative: De Gregori, Antonella et al
Ing. Barzano & Zanardo Milano S.p.A. Via Borgonuovo 10
20121 Milano
20121 Milano (IT)

   


(54) Electromagnetic safety relay


(57) An electromagnetic safety relay (90) comprising a coil (10) wound about a core, a metal frame (20), a movable armature (30) secured to the frame (20) and used to operate an assembly of contact carrier strips (50) consisting of fixed strips (5F) and mobile strips (5M), an actuator (40) guiding the movement of the strips (50), and a return spring (80) positioned below the frame (20) such that the system of active forces (given by the movable armature (30)) and of reactive forces (given by the return spring (80)) is asymmetric, ie is applied on the same side of the actuator (40). This constructional arrangement enables the fixed contact carrier strips (5F) to be given sufficient rigidity and enables a single compact and robust actuator model (40) to be used for the various configurations of the electrical contacts (70) of the relay (90). Moreover, differential malfunctions between the two sides of the assembly of electrical contacts (70) are prevented and it becomes possible to determine and indicate anomalies in the case of breakage of the actuator (40) with the relay (90) energized.






Search report