Optical isolation — purpose of optically coupled interrupter/isolator modules: “The optically coupled isolator interrupter module is used to transfer switching information between two electrically isolated points.” Evaluate this statement.

Introduction / Context:
Optical isolators (optocouplers) and interrupter modules use light to communicate signals across galvanic isolation. They are essential for breaking ground loops, protecting low-voltage logic from high-voltage transients, and sensing position or speed without electrical contact.

Given Data / Assumptions:

• Isolator contains a light emitter (LED) and a light sensor (phototransistor, photodiode, or phototriac).
• Input and output sides are electrically isolated but optically coupled.
• Interrupter modules may be slot-type sensors detecting the presence/absence of an opaque vane.

Concept / Approach:
Optical coupling transfers information via photons instead of electrons across a direct conductor, providing high isolation voltage. Driving the LED encodes a switching state; the detector reproduces this state on the isolated side. Interrupter modules convert mechanical motion (blocking/unblocking the optical path) into logic-level transitions, which is still “switching information” conveyed from a different domain without electrical continuity.

Step-by-Step Solution:

Verification / Alternative check:
Datasheets specify isolation voltages (e.g., 2.5 kV) and CTR (current transfer ratio), confirming the intent to pass control signals across isolation barriers in power supplies, motor drives, and digital interfaces.

Why Other Options Are Wrong:

• Incorrect: Contrary to the fundamental purpose of optocouplers.
• Valid only at DC below 12 V: Optocouplers work with logic-level AC or DC, limited by device bandwidth, not a fixed 12 V cap.
• Depends on LED wavelength only: Wavelength matters for sensitivity, but isolation function does not hinge solely on it.
• True only with magnetic shielding: Magnetic fields are not the primary concern; optical isolation is immune to conduction paths.

Common Pitfalls:
Confusing isolators with transformers or magnetic sensors; overlooking CTR, propagation delay, and creepage/clearance requirements in high-voltage designs.

Final Answer:
Correct