Air carrier captain reported responding to a RA; making evasive manuever; while level at 10;000 ft.

Attributes
ACN	1565033
Time
Date	201808
Local Time Of Day	1801-2400
Place
Locale Reference	ZOB.ARTCC
State Reference	OH
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Widebody Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	STAR ZABER 6
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance
Miss Distance	Vertical 400

Narrative:

Level at 10000 ft. Near zaber intersection; zaber 6 arrival into cle. Traffic appeared on TCAS at 10 o'clock position and 400 ft. Below. Received a traffic advisory from TCAS followed by a 'monitor vertical speed' followed by a resolution advisory to climb. PF (pilot flying) followed advisory and we climbed to 10;300 ft. Advisory cleared. We returned to 10;000 ft. And I advised ATC of our deviation and a resolution advisory. Traffic was never reported to us by ATC. Traffic not in communication with ATC.

Original NASA ASRS Text

Title: Air Carrier Captain reported responding to a RA; making evasive manuever; while level at 10;000 ft.

Narrative: Level at 10000 ft. near ZABER intersection; ZABER 6 arrival into CLE. Traffic appeared on TCAS at 10 o'clock position and 400 ft. below. Received a traffic advisory from TCAS followed by a 'monitor vertical speed' followed by a resolution advisory to climb. PF (Pilot Flying) followed advisory and we climbed to 10;300 ft. Advisory cleared. We returned to 10;000 ft. and I advised ATC of our deviation and a resolution advisory. Traffic was never reported to us by ATC. Traffic not in communication with ATC.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.