• Siemens SENTRON 3LD2 Load Transfer Switches (25–250 A)
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Siemens SENTRON 3LD2 Load Transfer Switches (25–250 A)

Siemens SENTRON 3LD2 Load Transfer Switches (25–250 A)

Siemens SENTRON 3LD2 load transfer switches up to 250 A for front mounting, floor mounting with door-coupling mechanism or in molded-plastic enclosure.

Key features

  • Uninterrupted current Iu 25 … 250 A at AC-21A, 380 … 440 V
  • 3P and 3P+N versions; enclosed versions with N and PE base terminal
  • Knob-operated mechanism, black; lockable with up to 3 padlocks (depending on size)
  • Four-hole mounting or metric screw connection (enclosure); bridging bars pre-assembled

Specifications

Brand Siemens SENTRON
Series 3LD2 load transfer switch
Handle Black
Catalog chapter 9 Transfer Switching Equipment
Product group Load transfer switches
Standard IEC 60947-3
Bridging bars Pre-assembled
Source Siemens Catalog LV 10 · 2026, p. 796-797
3LD2123-7UK01 Rated current Iu: 25 A | Power AC-23A/AC-3: 9.5 kW/7.5 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2165-7UB01 Rated current Iu: 25 A | Power AC-23A/AC-3: 9.5 kW/7.5 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2223-7UK01 Rated current Iu: 32 A | Power AC-23A/AC-3: 11.5 kW/9.5 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2265-7UB01 Rated current Iu: 32 A | Power AC-23A/AC-3: 11.5 kW/9.5 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2524-7UK01 Rated current Iu: 63 A | Power AC-23A/AC-3: 22.0 kW/18.5 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2566-7UB01 Rated current Iu: 63 A | Power AC-23A/AC-3: 22.0 kW/18.5 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2724-7UK01 Rated current Iu: 100 A | Power AC-23A/AC-3: 37.0 kW/30.0 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2766-7UB01 Rated current Iu: 100 A | Power AC-23A/AC-3: 37.0 kW/30.0 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2305-7UK01 Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2305-7UL01 Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Front, direct knob mechanism | Poles: 3P+N
3LD2318-7UK01 Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Floor, door-coupling knob | Poles: 3P
3LD2318-7UL01 Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Floor, door-coupling knob | Poles: 3P+N
3LD2405-7UK01 Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2405-7UL01 Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Front, direct knob mechanism | Poles: 3P+N
3LD2418-7UK01 Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Floor, door-coupling knob | Poles: 3P
3LD2418-7UL01 Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Floor, door-coupling knob | Poles: 3P+N
Switch DisconnectorsSiemens
16 product codes available in this family
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Siemens SENTRON 3LD2 Load Transfer Switches (25–250 A)

Brand Siemens·Switch Disconnectors

Available part numbers (16)

3LD2123-7UK01, 3LD2165-7UB01, 3LD2223-7UK01, 3LD2265-7UB01, 3LD2524-7UK01, 3LD2566-7UB01, 3LD2724-7UK01, 3LD2766-7UB01, 3LD2305-7UK01, 3LD2305-7UL01 + 6 more — see full table ↓

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Product codes & specifications
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Product codeSpec
3LD2123-7UK01Rated current Iu: 25 A | Power AC-23A/AC-3: 9.5 kW/7.5 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2165-7UB01Rated current Iu: 25 A | Power AC-23A/AC-3: 9.5 kW/7.5 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2223-7UK01Rated current Iu: 32 A | Power AC-23A/AC-3: 11.5 kW/9.5 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2265-7UB01Rated current Iu: 32 A | Power AC-23A/AC-3: 11.5 kW/9.5 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2524-7UK01Rated current Iu: 63 A | Power AC-23A/AC-3: 22.0 kW/18.5 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2566-7UB01Rated current Iu: 63 A | Power AC-23A/AC-3: 22.0 kW/18.5 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2724-7UK01Rated current Iu: 100 A | Power AC-23A/AC-3: 37.0 kW/30.0 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2766-7UB01Rated current Iu: 100 A | Power AC-23A/AC-3: 37.0 kW/30.0 kW | Version: Molded-plastic enclosure | Poles: 3P with N and PE base term.
3LD2305-7UK01Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2305-7UL01Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Front, direct knob mechanism | Poles: 3P+N
3LD2318-7UK01Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Floor, door-coupling knob | Poles: 3P
3LD2318-7UL01Rated current Iu: 160 A | Power AC-23A/AC-3: 75 kW/50 kW | Version: Floor, door-coupling knob | Poles: 3P+N
3LD2405-7UK01Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Front, direct knob mechanism | Poles: 3P
3LD2405-7UL01Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Front, direct knob mechanism | Poles: 3P+N
3LD2418-7UK01Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Floor, door-coupling knob | Poles: 3P
3LD2418-7UL01Rated current Iu: 250 A | Power AC-23A/AC-3: 132 kW/110 kW | Version: Floor, door-coupling knob | Poles: 3P+N

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