FF: Floating / Floating FG: Floating / Grounding Functions & Features • High discharge current capacity 20 kA (8 / 20 ps), 1 kA (10 / 350 ps) • Ultra-thin 7-mm-wide module can be mounted in high density • Excellent protection employing multi-stage SPD circuits • DIN rail mounting and grounding • Shield terminal provided • Life monitor function helps you to decide when you should replace the surge protector; reduces maintenance and prevents downtime • Incorporated battery • Pressing CHK (Check) button confirms with LEDs the degradation and life span of the surge protection circuits LIGHTNING SURGE PROTECTOR FOR STANDARD SIGNAL LINE (ultra-slim; life monitor) Specify a code from below for each of [1] through [3]. (e.g. MD7AST-24FF/Q) • Specify the specification for option code /Q (e.g. /C01) blank: none /Q: With options (specify the specification) COATING (For the detail, refer to our web site.) /C01: Silicone coating /C02: Polyurethane coating Construction: Slim-sized front terminal structure Degree of protection: IP20 Connection: Euro terminal block (torque 0.3 N'iri) Applicable wire size: 0.2 - 2.5 mm2, stripped length 8 mm Grounding: DIN Rail Housing material: Flame-resistant resin (black) Indicators: Activated by CHK (Check) button BAT: Green LED ALM: Red LED Degradation judged: When the leakage current at the voltage limiter exceeds approx. 7.5 pA. Life time judged: When the count of the discharge element discharging reaches the expected life span. CHK button: Push button; momentary Battery: Lithium; No recharge or replacement available. Battery life: 10 years (when used < 2 minutes/month) Operating humidity: 30 to 90 %RH (non-condensing) Mounting: DIN Rail (TH35-7.5, 1-mm-thick) Oxide film on the surface of an aluminium DIN rail may lower the electric conductivity between this module and the ground. Use a steel or copper rail.

EMC Directive EMI EN 61000-6-4 EMS EN 61000-6-2 RoHS Directive

MODEL: MD7AST CONNECTION EXAMPLES 4 – 20mA Field-mount Transmitter Surge Protector Protected Side Current Loop Supply Surge Side *1. Oxide film on the surface of an aluminium rail may lower the electric conductivity between this module and the ground. Use a steel or copper rail. *2. Be sure to ground the DIN rail. Recommended grounding resistance ≤100Ω *3. Cross-wire between the DIN rail and the metal housing of the protected device to equalize the earth potential. Ground only the surge protector when the protected device has no ground terminal. *4. Shield wiring method is an example. Proceed...

SHIELD TERMINAL SCHEMATIC CIRCUITRY ■ Line to SHLD: Floating • Earth to SHLD: Floating Surge Side Protected Side • Standard type • To protect a device having isolation between Signal and Earth. • When SHLD should be floating against the earth. (single-end grounding) DIN RAIL ADAPTOR (for grounding) • Line to SHLD: Floating • Earth to SHLD: Grounding To protect a device having isolation between Signal and Earth. When SHLD should be grounded. (single- or both-end grounding) Specifications are subject to change without notice. MD7AST SPECIFICATIONS ES-8067 Rev.6 Page 4/4