ABB MS116-1.6 1SAM250000R1006 Motor Circuit Breaker – MS116 Series

ABB MS116-1.6 1SAM250000R1006 — Thermal-Magnetic Motor Protection at the Branch Circuit Level

In a motor branch circuit, the protective device is the last line of defense between a fault condition and catastrophic winding failure. The ABB MS116-1.6 (catalog number 1SAM250000R1006) is a 3-pole manual motor starter and motor protective circuit breaker (MPCB) rated for a continuous current setting range of 1.0 to 1.6 A. It integrates thermal-magnetic trip technology into a single 45 mm-wide DIN rail device, replacing the conventional combination of a circuit breaker plus a separate overload relay — reducing panel footprint, wiring terminations, and potential failure points simultaneously.

Within ABB’s MS116 product family, the 1.6 A variant occupies the low-current segment, covering fractional-horsepower motors commonly found in HVAC fans, small pumps, conveyor auxiliaries, and control panel cooling units. The MS116 series is designed to IEC 60947-4-1 and EN 60947-4-1, the governing standards for motor starters and motor protective circuit breakers in industrial low-voltage systems. This compliance baseline ensures the device can be deployed in CE-marked machinery and IEC-governed installations without additional re-certification at the panel level.

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Technical Parameters

Hardware Logical Analysis

The MS116-1.6 employs a dual-element thermal-magnetic trip mechanism. The thermal element — a bimetallic strip assembly — responds to sustained overload currents above the set threshold. Heat generated by I²R losses in the bimetal causes progressive deflection; when deflection exceeds the mechanical trip threshold, the latch releases and all three poles open simultaneously. The thermal time constant is calibrated to Class 10 characteristics per IEC 60947-4-1, meaning the device trips within 10 seconds at 7.2× the set current from a cold state — a response profile matched to standard squirrel-cage induction motor starting transients.

The magnetic element is a fixed-threshold instantaneous trip coil. At fault currents typically exceeding 12× the maximum current setting (approximately 19.2 A for the 1.6 A variant), the magnetic flux generated by the fault current actuates the trip plunger within one half-cycle (<10 ms at 50 Hz). This sub-cycle response prevents the fault arc energy from reaching levels that would damage motor windings or bus conductors.

All three poles are mechanically coupled through a common trip bar. A single fault on any phase simultaneously opens all three poles, preventing single-phasing — a condition that causes rapid motor overheating due to negative-sequence current components. The trip bar also provides a mechanically distinct intermediate position between ON and TRIPPED, giving maintenance personnel an unambiguous visual indication of fault state versus intentional isolation.

The device’s contact system uses silver-alloy contacts with arc chutes designed for the low-current range. At 1.0–1.6 A operational levels, contact erosion per switching cycle is minimal, supporting the rated 20,000 mechanical endurance cycles. The arc chute geometry is optimized for the low-energy arcs characteristic of this current range, preventing contact welding under repetitive switching duty.

EMC performance is inherent to the device’s all-metal enclosure and the absence of electronic components in the trip circuit. The thermal-magnetic mechanism is immune to conducted and radiated electromagnetic interference — a significant advantage in environments with variable-frequency drives, welding equipment, or high-density switching power supplies operating nearby. No firmware, no susceptibility to transient-induced false trips.

System Integration Benefits

• Single-device branch circuit protection: Replaces the series combination of a miniature circuit breaker (MCB) and a separate bimetallic overload relay, reducing the number of terminal connections per motor circuit from 12 to 6 and cutting panel assembly time proportionally.
• Deterministic trip response: The thermal-magnetic mechanism provides a fixed, repeatable trip characteristic independent of ambient temperature compensation errors that can affect electronic overload relays under extreme thermal gradients.
• Accessory expansion without rewiring: Snap-on auxiliary contact blocks (HK1-11, HK1-20) and signaling contacts integrate directly onto the device body, enabling PLC-level motor status feedback without additional relay wiring.
• Shunt trip and undervoltage release compatibility: ABB MN (shunt trip) and MV (undervoltage release) accessories allow remote tripping via safety relay or PLC digital output, supporting emergency stop and power-loss protection architectures without external contactors.
• Fault state transparency: The three-position handle (ON / TRIPPED / OFF) provides immediate visual differentiation between a manual isolation and an automatic protective trip — reducing mean time to diagnosis (MTTD) during unplanned shutdowns.
• Coordinated protection with upstream devices: The MS116-1.6’s let-through energy (I²t) characteristics are documented in ABB’s coordination tables, enabling engineers to verify selectivity with upstream MCBs or fuses without empirical testing.
• DIN rail density: At 45 mm width per 3-pole device, the MS116-1.6 allows higher motor circuit density per meter of DIN rail compared to equivalent MCB + overload relay combinations, directly reducing panel enclosure size and material cost.
• Bus bar system compatibility: ABB’s MS116 series bus bar kits allow multi-motor assemblies to share a common supply bus without individual cable runs from the main distribution point, simplifying wiring topology in motor control centers (MCCs).
• IEC 60947-4-1 Type 2 coordination: When paired with specified ABB contactors (e.g., A9, A12), the MS116-1.6 achieves Type 2 short-circuit coordination — meaning no damage to either the starter or contactor under fault conditions, and the assembly is ready for re-use after fault clearance without component replacement.

Quality Assurance & Global Logistics

Every MS116-1.6 unit dispatched from our Xiamen facility is a genuine ABB-manufactured component sourced through verified industrial supply channels. Authenticity verification includes cross-referencing the catalog number 1SAM250000R1006 against ABB’s production label, inspecting the ABB hologram seal, and confirming packaging integrity. Units showing any sign of repackaging, label inconsistency, or mechanical damage are quarantined and not shipped.

Pre-shipment checks cover visual inspection of the adjustment dial calibration marks, confirmation that the trip mechanism actuates and resets correctly by manual test, and verification that all three poles open simultaneously on trip actuation. Certificates of conformity are available upon request for quality-controlled procurement processes.

Logistics from Xiamen operate through DHL Express, FedEx International Priority, and UPS Worldwide Express. Standard transit times to major industrial hubs: Europe 3–5 business days, Southeast Asia 2–3 business days, Middle East 4–6 business days, North America 4–6 business days. All shipments include full tracking, commercial invoice, and packing list. Export documentation for customs clearance — including HS code classification and country of origin certificate — is prepared at the time of dispatch. For time-critical orders, same-day dispatch is available for confirmed payment received before 14:00 CST.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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