BLASI – Key switch 2-position pulse
BLASI – Key switch 2‑position pulse is a compact key‑operated selector used in BLASI‑type automatic‑door and barrier systems that outputs a short “pulse” contact signal when the key is turned between its two positions. The 2‑position design means the key has a fixed OFF and ON (or RUN) state, and the “pulse” version typically closes the contact only while the key is being moved, returning to the nominal state when the key stops. This is useful for sending a one‑shot command (for example open‑door pulse, reset or test) to the BLASI control unit without holding the circuit energized. Technicians usually mount the switch in a BLASI‑operator tube or panel using a 22 mm cut‑out, wiring the pulse contacts into the BLASI safety or logic circuit.
Product Details
BLASI – Key switch 2‑position pulse sits on the BLASI control‑board rail or operator‑tube panel as a secure, key‑controlled source of transient control signals. When the operator turns the key from the first position to the second, the internal contacts briefly close (or open, depending on configuration), creating a short “pulse” that the BLASI controller interprets as a discrete command—such as initiating a door‑open cycle, releasing a lock, or resetting a timer—without changing the steady‑state mode of the door. After the key is fully turned and released, the contacts return to their default state, so the BLASI logic sees only a momentary action, which is cleaner and safer than a continuously held contact. This type of key‑switch pulse‑output design is common in industrial control and security systems, where a wired key switch sends short‑duration signals to control up to two separate circuits.
Typically, 2‑position pulse key‑switches of this family feature a steel or metal housing, screw‑type terminals for 1–2.5 mm² conductors, and a 22 mm panel‑mounting diameter, which matches many BLASI‑area panel and tube layouts. They are intended for indoor or lightly sheltered environments, where the panel is protected from dust and direct weather. The key‑cylinder often uses a standard‑profile key (for example Ronis‑type) so that BLASI‑area sites can keep a common key‑system across multiple control points. By using BLASI – Key switch 2‑position pulse, technicians and facility managers create a secure, auditable way to send momentary commands to BLASI‑based automatic‑door or barrier systems, improving both control‑logic clarity and overall safety.
Article No: 7900036
Additional information
| Brand | BLASI |
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