Siemens 3VL4740-3DC36-0AA0 VL400L Molded Case Circuit Breaker, 3‑Pole, 400 A (In), Icu 100 kA @415 V — TM Trip Unit

Siemens 3VL4740-3DC36-0AA0 — VL400L Series Molded Case Circuit Breaker, 3‑Pole, 400 A (In), TM Trip Unit

Overview

• Manufacturer: Siemens
• Model: 3VL4740-3DC36-0AA0 (VL400L family, size 3VL4)
• Type: Molded Case Circuit Breaker (VL400L) — 3‑pole main circuit, line protection with TM electronic overcurrent release
• Rated operational current (In): 400 A
• Adjustable rated current (Ir): 320…400 A (adjustable pick‑up initial value shown 320 A)
• Packaged/Single unit: single circuit breaker

Key electrical characteristics

• Maximum short‑circuit breaking capacity (Icu): 100 kA at 415 V AC (rated value)
• Operational short‑circuit current breaking capacity (Ics): 75 kA at 415 V AC
• Other Icu / Ics references from datasheet:
  • Icu: 200 kA @240 V; 75 kA @440 V; 50 kA @500 V; 20 kA @600 V (NEMA); 15 kA @690 V
  • Ics: 150 kA @240 V; 38 kA @500 V; 8 kA @690 V
• Rated operational voltage Ue: up to 690 V AC (main circuit: 690 V AC max; DC up to 500 V max)
• Insulation voltage: 800 V
• Surge voltage resistance: 8 kV

Protection & trip unit

• Overcurrent release design: TM (thermal/magnetic electronic trip unit with adjustable thermal overload)
• Overload protection: adjustable thermal overload trip unit
• Instantaneous short‑circuit trip adjustable range: initial 2,000 A, full‑scale 4,000 A (per datasheet adjustable instantaneous setting)
• Usage category: A (for system protection)
• Performance class: N

Mechanical & environmental

• Number of poles: 3
• Circuit‑breaker size: 3VL4 (VL400L family)
• Electrical endurance (typical): 10,000 switching cycles
• Mechanical service life (typical): 20,000 switching cycles
• Dimensions (H×W×D): 279.5 mm × 139 mm × 163.5 mm
• Mounting: fixed mounting
• Protection class: IP20
• Ambient operating temperature: 0 °C … 70 °C
• Storage temperature: -40 °C … 80 °C

Connection details

• Main contact connection arrangement: front side
• Connectable conductor cross‑sections (main contacts): flexible busbar 25×10; solid 50…300 mm²; finely stranded w/ end processing 50…240 mm²; stranded 50…300 mm²
• Type of electrical connection (main): screw‑type terminals

Product options & notes

• No integrated auxiliary/alarm switch or undervoltage release included in this model (per datasheet: auxiliary switch No; undervoltage release No).
• Product extension / optional motor drive: Yes (motor drive available as accessory).
• Certificates & suitability: IEC certified, very high switching capacity (L) per datasheet.

Ordering & documentation

• Datasheet reference: Siemens 3VL4740-3DC36-0AA0 (catalog and support pages available on Siemens Industry Mall and support portals).
• Verify full ordering code and accessory requirements (auxiliary contacts, motor drive, mounting kit) when placing order.

Safety & installation

• Follow Siemens installation instructions, local codes, and coordinate upstream protective devices based on Icu/Ics values.
• Ensure correct setting of TM trip unit for application (overload and instantaneous settings) and correct thermal derating at elevated ambient temperatures (datasheet lists reduced rated currents at >50 °C).
• De‑energize and apply lockout/tagout procedures during installation or maintenance.