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BS-02 bistable relay


BS-02/D BS-02/D BS-02/D The BS-02 is a bistable relay which can feature digital inputs (model BS-02/D) or inputs sensitive to voltage or current levels (models BS-02/Vac, BS-02/Vdc, BS-02/Iac and BS-02/Idc).

The BS-02 relay features multiple reversible contacts which switch simultaneously after receiving an external command. It is also distinguished from common relays by maintaining its state if the device loses power.

BS-02/D relay

The BS-02/D relay can feature up to 6 reversible contacts, which switch simultaneously upon receiving a digital command.

The BS-02/D can be specified with one SET input or with SET and RESET inputs. If specified with a single input, its contacts change state when a SET command is applied. In this configuration, the RESET input is ignored.

If the BS-02/D is specified with two inputs, its contacts switch to the inverted state when a command is applied to the SET input, and the inverted state is maintained until a command is applied to the RESET input.

Alternatively, the BS-02/D can be specified to change state when power is lost or when power is restored. In these cases, RESET is the only user-actuated input.

The BS-02/D can be specified to accept the following command types:

  • closing dry (voltage-free) contact;
  • opening dry (voltage-free) contact;
  • DC voltage application (e.g.: 0→125Vdc);
  • DC voltage removal (e.g.: 125→0Vdc);
  • AC voltage application (e.g.: 0V→220V, 60 Hz);
  • AC voltage removal (e.g.: 220V→0V, 60 Hz).

A physical RESET button is also optional.

BS-02/Vac, BS-02/Vdc, BS-02/Iac and BS-02/Idc relays

The BS-02/Vac, BS-02/Vdc, BS-02/Iac and BS-02/Idc are bistable relays featuring up to 3 reversible contacts, which switch simultaneously when a voltage or current reaches a setpoint.

Every BS-02 has a fixed setpoint, which causes a state change to the inverted state if exceeded.

The BS-02 returns to its normal state when one of the following conditions is satisfied:

  1. automatically, i.e., contacts return to their normal state when the input voltage (Vdc and Vac models) or current (Idc and Iac models) falls below the setpoint;
  2. when the relay is powered off (the relay is rearmed when power is restored);
  3. pressing a reset button on the relay's front panel;
  4. applying one of the following commands:
    • closing dry (voltage-free) contact;
    • opening dry (voltage-free) contact;
    • DC voltage application (e.g.: 0→125Vdc);
    • DC voltage removal (e.g.: 125→0Vdc);
    • AC voltage application (e.g.: 0V→220V, 60Hz);
    • AC voltage removal (e.g.: 220V→0V, 60 Hz).

A physical reset button can always be specified, in combination with one other reset condition.

Documentation
Manuals Best practices for installation The articles above were written by Keith Armstrong from Cherry Clough Consultants.
Electrical Characteristics
Power supply Universal 80-265V
Power consumption Less than 0.5 W
Contact isolation 2000 V, 50/60 Hz, 1 min.
Operating temperature -10 to 85 °C
Relative humidity 10 to 90%
Electrical Characteristics - Contacts
Nominal current 8 A
Maximum peak current 15 A
Nominal voltage 250 V
Maximum commutable voltage 400 V
Nominal load at AC1* 2000 VA
Nominal load at AC15* (230 Vca) 400 VA
Single-phase engine power (230 Vca) 0.3 kW
Minimum commutable load 300 mW, 5V and 5 mA
DC1* contact opening capacity 30V: 8A, 110V: 0.3A, 220V: 0.12A

*Conforming to IEC 158-1:

DC1 Slightly inductive DC loads.
AC1 Slightly inductive AC loads.
AC15 Electromagnetic AC loads.

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