Showing papers by "Phoenix Contact published in 1994"

Transient overvoltages protection element for supply network

Abstract: A transient overvoltage protection device in an arc-control chamber has two electrodes (2) which together form the inclined arcing-horns (6) separated by a divergent airgap (3) and also provide the connection terminals (5) to the supply network.An overvoltage monitoring and spark flashover section comprises a slotted insulator (10) aligned with a transverse hole (7) which collectively ensure a reliable response to transient potentials and initiate movement of the arc roots along the arcing-horn surfaces (8).The insulator (10) and parts of the arc chamber are of inorganic material to exclude carbon/soot contamination and the electrodes (6) are equipped with cooling fins (9) for improved energy rating/arc extinction

Transient overvoltage protection device e.g. for telecomms. facilities

Abstract: An overvoltage protection element for diverting transient excess voltages includes two electrodes (2) with an effective air breakdown spark path (3) between them. Each electrode (2) has a connector (5) with an associated obliquely positioned arcing horn (6), with both arcing horns (6) of the mutually spaced electrodes (2) together forming the air breakdown spark path (3). A quench-plate (23) arrangement comprising at least one preferably several quenching plates (22) is provided in the housing (4).

Electrical PCB terminal

Abstract: The clamp terminal has a housing (4) with an opening (3) for reception of a conductor and an adjacent clamping screw (7) acting on a conductor element (11) through into engagement with the inserted conductor and having a soldering pin (10) projecting from the housing to fit perpendicularly through a PCB (2).The conductor insertion direction (12) is parallel to the soldering pin, the conductor element being U-shaped with one arm provided by the soldering pin and the other arm acted on by the clamping screw.

Transmitting data and auxiliary power simultaneously via symmetrical two=wire bus

Abstract: The method is applied for simultaneous transmission of data and auxiliary energy via a symmetrical two wire line (bus 3). Several bus subscribers (2) are connected into the system. Each subscriber (2) has a receiver (10) at the input side and a transmitter (5) at the output side.For the simultaneous data and energy transmission, a DC voltage (4) is applied to at least one point on the two wire line (3). The data are transmitted as current signals. At the input of each subscriber (2) the two wire line (3) is essentially short circuited for the data by a capacitor (18). The short circuit current is fed to the receiver input. The bus (3) passes from the capacitor (18) via a choke element (7) with low DC resistance to block return data transmission. The symmetrical transmitter output is coupled to the two wire line (3) after the choke element (7).

Optical fibre connector with monitoring device

Abstract: The connector (31) contains an optical transmitter or receiver device (17,7) coupled to the receiver or transmitter (12,2). The optical component of the transmitter or receiver device (17,7) is located at the optical conductor (4). The receiver device (7) is located at the point of coupling between the transmitter (2) and the optical conductor (4). In the event of faults or an inadequate connection of the optical fibre this detects stray optical energy from the transmitter (2). An equivalent transmitter device (17) is fitted with the receiver (12).

Edge connector unit for circuit boards

Abstract: A multi-contact connector for use with circuit boards has a main panel section of insulating plastic (13) that has contact tracks (5-12) formed on one side with separating ridges (18) in between. The contacts are brought out to one edge (3) as pins located in a shrouded section that forms a connecting socket. The other ends of the contacts form pins (4) that can be inserted and soldered into holes on the circuit baord. The circuit board is inserted into a housing with the socket providing an edge connector.

Emergency off current loop

Abstract: An emergency off current loop (1) for the emergency shutdown of a machine or an installation is illustrated and described, having an emergency off button (2) designed as a break contact and having a contactor (3) which is in series with the emergency off button (2) and has main contacts (4) designed as make contacts, the main contacts (4) of the contactor (3) being situated in the main circuit of the machine or installation which is to be shut down in the event of an emergency. In the case of the emergency off current loop (1) according to the invention, a further emergency off button (17) or further emergency off buttons (17) can easily be inserted without an undesired emergency shutdown occurring, to be precise in that an emergency off loop extension connection (9) is provided in series with the emergency off button (2) and the contactor (3), the emergency off loop extension connection (9) has two extension connection terminals (10, 11) and the extension connection terminals (10, 11) are bridged or can be bridged, on the one hand, by a bridging plug (12) and, on the other hand, by a bridging button (13) designed as a make contact.

Electronic signalling device for monitoring e.g. fuses - has capacitance of piezoceramic sound emitter used as capacitance of RC generator

Abstract: The electronic signalling device includes a piezoceramic sound emitter (1) and a direct current or alternating current supplied RC-generator (2). The capacitance of the piezoceramic sound emitter is utilised as the capacitance of the RC-generator. A voltage controlled switch (4), in particular a bidirectional trigger diode, is connected in parallel to the piezoceramic sound emitter. The voltage controlled switch controls discharging of the RC-generator. A charging resistance (3) of the RC generator is chosen so that after operation of the voltage controlled switch no current flows. ADVANTAGE - Especially simple in terms of components and circuit technology.