The Siemens 5SQ21-220-G63 is a C Curve miniature circuit breaker (MCB) designed for DIN rail mounting in distribution boards and control panels. It's part of the 5SQ2 series, a standard offering for branch circuit protection in commercial and light industrial installations. The C Curve trip characteristic means it handles inrush currents typical of motor starters and transformers — it holds through a short-duration surge up to 5-10x rated current, then clears a hard fault fast.
Siemens 5SQ21-220-G63 C Curve DIN Rail MCB, Current Producti
MPN5SQ21-220-G63
Siemens 5SQ21-220-G63, C Curve miniature circuit breaker, DIN rail mount, 0.11 kg, current production.
$15.27Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Weight | 0.11 kgs |
Product details
Frequently asked questions
Where can I buy the 5SQ21-220-G63?
This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment.
What does the C Curve mean on this breaker?
The C Curve trip characteristic means the magnetic trip fires at 5 to 10 times the rated current. That's the standard choice for motor circuits, transformers, and lighting banks with a moderate inrush — it won't nuisance-trip on startup but clears a hard short fast.
MPN
5SQ21-220-G63