RMC-121D https://www.deif.com/products/protection-relays/rmc-121d/ en Wed, 07 Oct 2026 10:23:27 GMT Active 28c27067-a7f1-44e7-aeb0-105f50168904 The RMC-121D combined short circuit and over-current relay is applied for protection of generators against both over-currents and short circuit currents.

]]> The RMC-121D combined short circuit and over-current relay is applied for protection of generators against both over-currents and short circuit currents (I> + I>>).

RMC-121D has two sets of contacts.

Variants

RMC-111D

  • Short circuit
  • I>>: 100 to 400 %. <50 mS response time

RMC-121D

  • Short circuit
  • I>>: 100 to 400 %. 2 sets of contacts (parallel)

RMC-122D

  • Short circuit and over-current
  • I>>: 100 to 400 %, I>: 50 to 150 %
  • Combined functionality

RMC-131D

  • Differential current
  • I>>: 100 to 400 %. 2 sets of contacts (parallel).
]]>
  • Short circuit and over-current circuit relay (I> + I>>)
  • ANSI code 50 and 51
  • Measurement of 3-phase currents
  • LED indication of fault condition
  • Timer-controlled tripping
  • LED indication for activated relay
  • 35 mm DIN rail or base mounting
    • ]]>     DNV TAA00000Z2 5 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/nfvgb22e/dnv-taa00000z2-5-uk.pdf?rnd=134244406714070000&v=9 f3606a71-3e84-4fb6-9020-d4eb7d36145e LMR-111D Thu, 28 May 2026 11:17:51 GMT 2026-05-28T11:17:51+00:00 2026-05-28T11:17:51+00:00 eng document E Approvals/Certifications General safety note 4189341189 UK-FR.pdf https://deif-cdn-umbraco.azureedge.net/media/t3ofzpjw/general-safety-note-4189341189-uk-fr.pdf?rnd=134044972194400000&v=9 bd5c5d87-9036-4df9-881e-cc1bd5ed3b40 MDR-2 Thu, 09 Oct 2025 15:26:59 GMT 2025-10-09T15:26:59+00:00 2025-10-09T15:26:59+00:00 eng document C Other Technical Documentation RMC-121D Data sheet 4921240260 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/w1bbk4sa/rmc-121d-data-sheet-4921240260-uk.pdf?rnd=133972982216770000&v=9 7a05c3ae-f540-429e-9509-8ef97ed6d952 RMC-121D Fri, 18 Jul 2025 07:43:41 GMT 2025-07-18T07:43:41+00:00 2025-07-18T07:43:41+00:00 eng document E Data Sheet EPN RMC RMV RMP RMQ RMF LMR 3D STEP-files.zip https://deif-cdn-umbraco.azureedge.net/media/vfshtin0/epn-rmc-rmv-rmp-rmq-rmf-lmr-3d-step-files.zip?rnd=133885726686130000&v=9 a17964b1-d6ba-4265-a48c-44dc0700f68d EPN-110DN Tue, 08 Apr 2025 07:57:48 GMT 2025-04-08T07:57:48+00:00 2025-04-08T07:57:48+00:00 eng document A Drawings BV 07644-D0 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/0kmbx10m/bv-07644-d0-uk.pdf?rnd=133854639866170000&v=9 ef0b99ca-614c-4c5e-95d0-def6142c735f EPN-110DN Mon, 03 Mar 2025 08:26:26 GMT 2025-03-03T08:26:26+00:00 2025-03-03T08:26:26+00:00 eng document F Approvals/Certifications CCS GB23PTB00059 04 UK.PDF https://deif-cdn-umbraco.azureedge.net/media/q0mcwols/ccs-gb23ptb00059-04-uk.pdf?rnd=133584254713770000&v=9 392b989e-5272-41c6-8562-ea5d45848873 LSU-112DG Wed, 24 Apr 2024 09:44:31 GMT 2024-04-24T09:44:31+00:00 2024-04-24T09:44:31+00:00 eng document A Approvals/Certifications RINA ELE114522XP UK.PDF https://deif-cdn-umbraco.azureedge.net/media/naunrfqq/rina-ele114522xp-uk.pdf?rnd=133578853901170000&v=9 96c82970-a210-4898-bfb6-e536910b0edc LMR-111D Thu, 18 Apr 2024 03:43:10 GMT 2024-04-18T03:43:10+00:00 2024-04-18T03:43:10+00:00 eng document A Approvals/Certifications KRS CPH06107-AC007.pdf (1) https://deif-cdn-umbraco.azureedge.net/media/utzfecj5/krs-cph06107-ac007.pdf?rnd=133578853825330000&v=9 0942f3bc-cf3f-4713-854d-f9f4244a031c LSU-112DG Thu, 18 Apr 2024 03:43:02 GMT 2024-04-18T03:43:02+00:00 2024-04-18T03:43:02+00:00 eng document A Approvals/Certifications LR LR22450906TA UK.pdf https://deif-cdn-umbraco.azureedge.net/media/jrehf2gb/lr-lr22450906ta-uk.pdf?rnd=133578853749570000&v=9 f0624954-3ac1-46b6-8e47-341d54b4152f LSU-112DG Thu, 18 Apr 2024 03:42:54 GMT 2024-04-18T03:42:54+00:00 2024-04-18T03:42:54+00:00 eng document A Approvals/Certifications UL 20101217-E233044 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/lcvlztgd/ul-20101217-e233044-uk.pdf?rnd=133578853381070000&v=9 ccbcaa40-81c3-4eb7-abb8-5909a27f0775 EPN-110DN Thu, 18 Apr 2024 03:42:18 GMT 2024-04-18T03:42:18+00:00 2024-04-18T03:42:18+00:00 eng document A Approvals/Certifications RMC-121D Installation instructions 4189340260 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/i2wne4um/rmc-121d-installation-instructions-4189340260-uk.pdf?rnd=133578853276100000&v=9 7ad22d5f-1b8c-4c82-8ec7-24a9c9058cab RMC-121D Thu, 18 Apr 2024 03:42:07 GMT 2024-04-18T03:42:07+00:00 2024-04-18T03:42:07+00:00 eng document A Installation Instructions UKCA DoC 4910290527 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/4x5fcisc/ukca-doc-4910290527-uk.pdf?rnd=133578853260870000&v=9 2251feed-8542-4abf-b800-ff74f075cd70 LMR-111D Thu, 18 Apr 2024 03:42:06 GMT 2024-04-18T03:42:06+00:00 2024-04-18T03:42:06+00:00 eng document A Approvals/Certifications CE DoC 4910290027 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/ecwarg1i/ce-doc-4910290027-uk.pdf?rnd=133578853228670000&v=9 9b08ac38-0e68-4973-a7dd-bd44e62739e5 LMR-111D Thu, 18 Apr 2024 03:42:02 GMT 2024-04-18T03:42:02+00:00 2024-04-18T03:42:02+00:00 eng document K Approvals/Certifications RMC-121D Installation instructions 4189340260 DK.pdf https://deif-cdn-umbraco.azureedge.net/media/k4rigr55/rmc-121d-installation-instructions-4189340260-dk.pdf?rnd=133578853045230000&v=9 4783a24f-02ff-4819-a880-0dfed7beb6b4 RMC-121D Thu, 18 Apr 2024 03:41:44 GMT 2024-04-18T03:41:44+00:00 2024-04-18T03:41:44+00:00 dan document A Installation Instructions RMC-121D Installation instructions 4189340260 DE.pdf https://deif-cdn-umbraco.azureedge.net/media/5g4h5azl/rmc-121d-installation-instructions-4189340260-de.pdf?rnd=133578852911130000&v=9 837fbce1-372b-4065-a4d8-22977fb73f1b RMC-121D Thu, 18 Apr 2024 03:41:31 GMT 2024-04-18T03:41:31+00:00 2024-04-18T03:41:31+00:00 deu document A Installation Instructions RMV_RMC_RMP_RMQ_RMF green passport 4123000020A MEPC.197(62).pdf https://deif-cdn-umbraco.azureedge.net/media/rvwhfm5w/rmv_rmc_rmp_rmq_rmf-green-passport-4123000020a-mepc-197-62.pdf?rnd=133578852690430000&v=9 b3726d95-2ef6-4b54-99d1-b659fc98a295 RMC-111D Thu, 18 Apr 2024 03:41:09 GMT 2024-04-18T03:41:09+00:00 2024-04-18T03:41:09+00:00 eng document A Approvals/Certifications Type certificate 4124030041 UK.pdf https://deif-cdn-umbraco.azureedge.net/media/czkhrg0t/type-certificate-4124030041-uk.pdf?rnd=133578852496030000&v=9 9b78550e-5953-4f72-8039-582620fe6e40 RMC-111D Thu, 18 Apr 2024 03:40:49 GMT 2024-04-18T03:40:49+00:00 2024-04-18T03:40:49+00:00 eng document B Approvals/Certifications