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- USA
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Ships within 48 hours · Estimated delivery Jul 3 - Jul 8
For Your Every Summer RSVP, with Code: SUMMER15
Description
NCE 524-205 BD-20 BD20 DCC Block Detection / DetectorNCE 524 205 BD 20 BD20 DCC Block Detection Detector. Detects DCC track current being drawn through a single track feeder. Isolated so there is no direct electrical connection to the track. Needs no external power for most operations. Can be connected to the NCE AIU01 or Mini Panel. Can an light up LED or operate a relay when used with external DC power (5 12 Volts). Suitable for DCC track power up to 20 Amps.

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4.6 ★★★★★
Based on 447 reviews
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Product Reviews
★★★★★ 5
perfect fit
Size: (Pack of 1)
Buy this. 3-minute install. Youtube it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2025
★★★★★ 4
Did its job
Size: (Pack of 1)
No complaints and did what it was intended for. Nice fit.
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Reviewed in the United States on September 16, 2024
★★★★★ 5
Excellent Quality
Size: (Pack of 1)
Nice quality.
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Reviewed in the United States on June 7, 2025
★★★★★ 5
Super easy and inexpensive
Size: (Pack of 1)
It was super easy to swap out myself! I just searched “how to change engine air filter 2017 Acura RDX” on YouTube and watched the first video that popped up. It took me longer to type this than it did to change the filter. Plus, this one cost about a third of what Valvoline was going to charge me to replace it.
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Reviewed in the United States on August 10, 2025
★★★★★ 5
Great
Size: (Pack of 1)
Great
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Reviewed in the United States on December 31, 2025




