Siemens 3RH1921-1HA22 コンタクタサイドマウントアクセサリ

正式な製品名: SIRIUS side-mounted auxiliary switch block, 4-ポール, 2NO+2NC, ネジ端子

製品の状態: 製造中止 (PLM PM500). It is an older accessory for 3RT1 接触器. The new-generation replacement series is 3RH29xx

モデルの命名法

3RH: SIRIUS auxiliary switches / contactor relay accessories

19: External side-mounted auxiliary contacts for contactors

21: Side snap-on mounting, fits S0～S3 contactor sizes

1: ネジ端子; 2 = spring-cage terminals (3RH1921-2HA22)

ハ: 4-pole side-mounted contact block

22: 接点構成 2 通常開 + 2 通常閉 (2NO+2NC)

主要な技術的パラメータ
連絡先: 2NO+2NC, 4-ポール, EN準拠 50012
取り付け: Snap-on side installation on the contactor
Compatible base unit: SIRIUS 3RT1 motor contactors, frame sizes S0 / S2 / S3
端子: ネジ式, wire cross-section 0.5~2.5 mm²
保護: Front face IP20
定格絶縁電圧: 690 V (汚染度 3), インパルス耐電圧 6 kV
持久力: 機械的寿命 10 100万動作サイクル; AC-15 230V electrical life 200,000 サイクル
動作温度: -25 ～ +60 ℃; 保管温度: -55 ～ +80 ℃
Contact reliability: 17 V / 1 ミリアンペア, 最大 1 failure within 100 100万操作
アプリケーションシナリオ

Side expansion of auxiliary contacts for 3RT1 (S0~S3) ACコンタクタ

PLC feedback signals, ステータス表示, インターロック回路, fault signal output

Motor start-stop control circuits, ファン & water pump control panels, low-voltage switchgear cabinets

注記: Side auxiliary switches can only be fitted on the left side of the contactor. The total number of NC contacts is limited; positively driven contacts must be verified for safety interlock applications.

置換選択 (Discontinued Upgrade)

Original model discontinued. The corresponding side-mounted unit for new 3RT2 (S0~S3) 接触器:

3RH2921-1DA22 (ネジ端子, 2NO+2NC side-mounted auxiliary switch)

トラブルシューティング & Inspection Guidelines
Common failures: 接触酸化, contact burning, loose snap-fit clips leading to intermittent feedback signals
Multimeter test: With the contactor de-energized, NC contacts shall be conducting and NO contacts open; contact status flips when the coil is energized
配線チェック: Tighten all terminal screws firmly; loose thin wires frequently cause unstable PLC digital inputs
交換: Direct snap-on disassembly without touching the main power circuit; always test interlock logic after replacement
Cross-reference List for the Same Series

3RH1921-1HA22: ネジ端子, 2NO+2NC, side mount S0–S3 (製造中止)

3RH1921-2HA22: Spring-cage terminals, same contact configuration (製造中止)

3RH2921-1DA22: New-generation screw-type side-mounted 2NO+2NC (代替機種)

シーメンス 3RT1 Contactor Replacement Overview

3RT1 (S00~S3, ≤95A) 廃止されました (PLM PM500). First-choice official direct replacement: 3RT2 (imported SIRIUS Innovation series). For cost-saving domestic alternatives, select 3RT6 / 3RT5. Larger frame 3RT1 (>95あ) remains available with no forced phase-out schedule

3RT2 [輸入品, Preferred OEM Replacement]

シリーズ: 3RT20xx, direct replacement for legacy 3RT10xx

Frame size match: S00 / S0 / S2 / S3, AC-3 current range 7A~95A

置換ルール:

例: 3RT1024-1BB40 → 3RT2024-1BB40. Keep coil voltage and rated current unchanged; only change the middle digit from 1 に 2.

Critical compatibility note (relevant to your 3RH1921 auxiliary contacts):

Old 3RH1921 cannot be used on 3RT2; you must upgrade to 3RH2921 series auxiliary switches together with the contactor body.

Large-size 3RT1 (S6 / S10 / S12, Still Active, Not Discontinued)

S6 (3RT105×, Frame S6, 115A~150A, 55kW~75kW @400V)

Base Order No.	AC-3電流	モーター出力 (400V)	端子の種類	マッチングアクセサリー
3RT1054	115 あ	55 kW	スクリュー / box terminals	補助接点: 3RH1951; Overload relay: 3RU1156
3RT1055	150 あ	75 kW	スクリュー / box terminals	補助接点: 3RH1951; Overload relay: 3RU1156

Complete model examples: 3RT1054-6AF36, 3RT1055-6NB36

S10 (3RT106×, Frame S10, 185A~225A, 90kW~110kW @400V)

Base Order No.	AC-3電流	モーター出力 (400V)	端子の種類	マッチングアクセサリー
3RT1064	185 あ	90 kW	Busbar terminals	補助接点: 3RH1961; Overload relay: 3RU1166
3RT1065	225 あ	110 kW	Busbar terminals	補助接点: 3RH1961; Overload relay: 3RU1166

S12 (3RT107×, Frame S12, 265A~300A, 132kW~160kW @400V)

Base Order No.	AC-3電流	モーター出力 (400V)	端子の種類	マッチングアクセサリー
3RT1075	265 あ	132 kW	Busbar terminals	補助接点: 3RH1971; Overload relay: 3RU1176
3RT1076	300 あ	160 kW	Busbar terminals	補助接点: 3RH1971; Overload relay: 3RU1176

S14 (Extra-large frame, still available)

3RT1096: 400あ / 200kW

3RT1097: 500あ / 250kW

Dedicated Accessories for S6/S10/S12 (Not Interchangeable with S00~S3)

(1) Side-mounted auxiliary switches (Base unit already has built-in 2NO+2NC; add-on optional)

S6: 3RH1951

S10: 3RH1961

S12: 3RH1971

Important reminder: 3RH1921 (for small frames) cannot be installed here due to incompatible snap-in geometry.

(2) Plug-in thermal overload relays (direct plug-on mounting with 3RT1)

S6: 3RU1156

S10: 3RU1166

S12: 3RU1176

(3) Mechanical interlocks (for reversing contactor pairs)

S6: 3RT1951

S10: 3RT1961

S12: 3RT1971

Coil Voltage Suffix Codes (Universal for all frames)

1AB36: AC/DC 24 V

1AD36: AC/DC 48 V

6AF36: AC/DC 110~127 V

6AU36: AC/DC 200~277 V (広電圧コイル)

Phase-out Boundary Rules (致命的)
3RT101~3RT104 (S00~S3, ≤95A): PM500, fully discontinued. Must migrate to 3RT2 / 3RT6.
3RT105~3RT107 (S6/S10/S12): PM300, active production, long-term supply, no end-of-life plan.
Future upgrade path (if needed): 3RT105 → 3RT205; 3RT106 → 3RT206; 3RT107 → 3RT207. Replace accessories with 3RH2951/2961/2971 accordingly.
Popular Complete Order Numbers
3RT1054-6AF36｜S6, 115あ, AC/DC 110V coil
3RT1055-6NB36｜S6, 150あ, 広電圧コイル
3RT1064-6AU36｜S10, 185あ, AC/DC 240V coil
3RT1065-6AU36｜S10, 225あ, AC/DC 240V coil
3RT1075-6AU36｜S12, 265あ
3RT1076-6AU36｜S12, 300あ