Latching/interface and switching relays are ideal connecting links between the highly-sensitive and low-power logic circuitry of a PLC, control system or process computer and the raw environment of the power level on a machine such as motor drives, magnetic clutches or hydraulic cylinders. The relays ensure a metallic isolation between logic and power circuitry.
There is a differentiation between bistable devices (latching relay) and monostable devices (cinterface or switching relay). The latter are available as power/industrial relays up to 16 A with pin base and socket for top hat rail mounting or as complete solution for installation in switch cabinets and distribution boards, or as positive-action devices for safety applications.
Advantages
One-stop offering: Wide choice from a complete range with several designs for a variety of applications
Save time for installation and maintenance by pin bases snapping on top hat rails
For medium or low switching frequency many times more cost-effective alternative compared to semiconductors Insensitive to overcurrent/overvoltage
Latching relays: Energy-saving solution for applications with desired latching properties, the stored condition is kept even after removal of the control pulse or voltage drops
Technology
Inadvertent pulses on the input side of a control may cause false triggering or, if containing a larger amount of energy, serious damages to an electronic control system. On their output side, electronic control systems must be protected against short-circuits and reactions by inductive loads. DOLD coupling modules, both input (imod) and also output (omod) modules, meet following criteria and thus they are suited for all interface applications in demanding control systems:
Safe electrical isolation between control and load circuits acc. to VDE 0106 Part 101 (e.g. between CPU and sensors or actuators)
Highly effective interference suppression
Signal conditioning
Coupling relays with semiconductor output (IK 3070.91; .95)
For higher switching frequencies
For bounce-free switching
Optionally with transistor or triac output
Long service life
Low trigger power
Electromechanical coupling relays
Electromechanical I/O modules work with one switching contact on the output and include a high-quality PCB relay with following features:
Low contact resistance
Switch any d.c. and a.c. loads
With gold-plated contacts suited for low-level signals in analog controls
Applications
DOLD latched/interface and switching relays are suited for all interface applications in demanding control systems.
Latching relays: e.g. in the control circuit of high voltage switchgear of electricity supply companies
Interface/switching relays: e.g. in materials handling, hoists, injection moulding machines, wood working machines
Latching/interface and switching relays are ideal connecting links between the highly-sensitive and low-power logic circuitry of a PLC, control system or process computer and the raw environment of the power level on a machine such as motor drives, magnetic clutches or hydraulic cylinders. The relays ensure a metallic isolation between logic and power circuitry.